An A-Z reference of 111 Japanese terms drawn from sword anatomy, steel craft, martial art practice, dojo etiquette, and the classical schools. Entries are drawn from the vocabulary active in these pages – the language of the blade, the forge, and the practice hall. Use the letter index below to jump to any section.
The combative art of drawing the sword. An older, explicitly martial framing of what modern practice calls Iaido or Iaijutsu – emphasising rapid draw-cut-resheathe as a complete encounter-ending technique.
The full set of protective armour worn in Kendo: men (head), kote (wrists), do (torso), and tare (waist). Modern bogu ranges from machine-stitched budget sets to hand-stitched cotton competition armour.
A solid wooden training sword used across virtually all Japanese sword arts. Bokken (wooden sword) and bokuto (wooden blade) are interchangeable terms. Used for kata practice, partner drills, and suburi.
The temper pattern (hamon) in the kissaki (tip) of the blade. Boshi style – whether it turns sharply (ko-maru), sweeps broadly (o-maru), or runs straight – is a key feature in sword authentication and school attribution.
Martial Way. The modern framing of Japanese martial arts as disciplines for personal development and character cultivation, not merely combat technique. Kendo, Iaido, and Judo are all budo in this sense.
Martial Art – specifically in the sense of combat technique, contrasted with budo’s philosophical emphasis. Koryu (classical) schools are technically bujutsu; modern sports-oriented arts are budo.
The symbolic gesture of shaking blood from the blade before resheathing, performed in Iaido kata. Chiburi is a formalised ritual movement – its specific form varies between schools.
A clove-blossom shaped hamon pattern associated with Bizen-tradition swords. Choji hamon appears as rounded lobes or bud-shapes along the temper line and is considered one of the most aesthetically complex hamon types.
Middle guard – the standard fighting stance in Kendo and Kenjutsu, with the shinai or sword pointing at the opponent’s throat. Chudan no kamae is the default from which all attacks and defences originate.
1) The torso protector in Kendo bogu, covering the chest and sides. 2) A valid scoring target in Kendo: a diagonal cut to the side of the do. 3) The philosophical suffix in Kendo and Iaido meaning ‘way’ or ‘path’.
Training hall. Literally ‘place of the Way’. The physical space where martial arts are practiced. Dojo etiquette (rei-ho) includes bowing at entry and exit, addressing seniors correctly, and maintaining silence during practice.
The metal collar fitting at the top of the tsuka (handle), between the guard (tsuba) and the handle wrapping. Fuchi and kashira (pommel cap) are typically made as a matched pair and carry decorative motifs.
A padded practice sword – a thin bamboo stave enclosed in a leather or fabric sleeve. Invented in the 16th century by Shinkage-ryu to allow full-contact partner practice safely. The historical ancestor of the modern shinai.
The movement of raising the sword overhead in preparation for a downward cut. A fundamental Iaido movement appearing in nearly every kata, requiring correct balance, shoulder mechanics, and blade control.
Lower guard – a stance with the sword tip lowered toward the opponent’s knees or the floor. Gedan no kamae is primarily used defensively and appears in classical kenjutsu forms.
The Five Traditions – the five major regional schools of sword-making that flourished in medieval Japan: Yamashiro, Yamato, Bizen, Soshu (Sagami), and Mino. Each tradition has distinct stylistic signatures in hamon, hada, and blade geometry.
A wavelike or notched hamon pattern – one of the most common hamon types. Gunome appears as a regular series of rounded bumps or notches along the temper line. Many historical variations exist: ko-gunome (small), o-gunome (large), gunome-midare (irregular).
The cutting edge of the blade. The ha is the hardened zone created by differential heat treatment. In Japanese sword terminology, the ha faces downward when the katana is worn in the belt and upward for tachi.
The blade collar – a wedge-shaped metal sleeve fitted to the base of the blade (just above the nakago). The habaki locks the sword in its saya (scabbard) by friction and prevents the blade from rattling.
The grain pattern of the steel visible on the polished ji (flat area) of the blade. Different folding and working techniques produce characteristic patterns: itame (wood-burl), mokume (wood-figure), masame (straight grain), ayasugi (wavy cedar).
High-carbon edge steel in traditional sword construction. In a differentially constructed blade, hagane forms the cutting edge and is harder than the shingane (core) steel.
The small notch at the base of the cutting edge, where the blade proper meets the nakago (tang). Together with the munemachi (spine notch), the hamachi defines the exact start of the blade length (nagasa).
The temper line – the visible boundary between the hardened edge zone (yakiba) and the softer body of the blade, produced by differential heat treatment. The hamon is a primary aesthetic and technical feature of Japanese swords.
A guard with the sword held vertically beside the head, blade pointing upward. Hassou no kamae appears in classical kenjutsu and in the Nihon Kendo Kata; it is rarely used in modern Kendo sparring.
A groove or fuller running along the length of the blade, typically on the shinogi-ji (upper flat area). The hi reduces blade weight without sacrificing rigidity and produces an audible sound in motion. Also called bo-hi for full-length versions.
A blade with hardening that covers the entire surface, not just the edge – creating a hamon that appears to engulf the whole blade. Associated with Soshu-tradition smiths of the Nanbokucho period (14th century).
The Way of Drawing – the modern Japanese sword art focused on the draw, cut, and resheath as a complete practice. Iaido emphasises philosophical and meditative development through solo kata.
The Art of Drawing – the classical, combat-oriented ancestor of Iaido. Some schools use this term to signal a curriculum that retains partner practice (kumitachi) and an explicit martial focus.
A full scoring point in Kendo – the winning unit of competition. An ippon requires correct targeting, correct striking zone (monouchi), good posture and zanshin, and appropriate spirit (kiai). Two ippon win a standard match.
Wood-board grain pattern in jihada – one of the most common hada types, appearing as curved, interlocking shapes resembling the cross-section of a board. Ko-itame (fine), o-itame (large), and flowing itame are recognised subtypes.
The wrapping cord on the tsuka (handle). Traditionally silk, now often cotton or synthetic. Wound in a specific diagonal pattern that creates a firm, non-slip grip while accommodating the menuki ornaments beneath.
The flat area of the blade surface between the shinogi (ridge line) and the hamon (temper line). The ji is where hada (grain pattern) and nie/nioi activity in the hamon are most visible under angled light.
The steel quality of the ji – its colour, clarity, and the liveliness of its grain. Superior jigane has a deep, rich colour, uniform grain, and fine utsuri (reflective activity). Jigane assessment is fundamental to sword connoisseurship.
Upper guard – a high stance with the sword raised above the head. Jodan no kamae is an attacking posture that threatens powerful downward cuts; skilled jodan players can be formidable in Kendo competition.
Important Sword – the principal formal designation awarded by the NBTHK to blades of significant historical, artistic, or technical merit. Above Juyo is Tokubetsu Juyo (Especially Important Sword), the highest designation for non-National Treasure blades.
Guard or stance – the preparatory posture from which techniques are launched and received. Major kamae in Kendo include chudan, jodan, gedan, hassou, and waki no kamae.
The pommel cap at the butt end of the tsuka (handle). Made as a matched set with the fuchi (collar), kashira designs reflect period aesthetics and the owner’s taste.
Fixed practice form – a prearranged sequence of techniques performed solo or with a partner, encoding tactical principles, strategies, and technical standards. Kata are the primary transmission vehicle for classical martial arts.
The primary Japanese long sword of the Edo period and after, worn edge-up in the belt. Blade length typically 60-75 cm. The most recognised Japanese sword type globally.
The outer skin steel in laminated blade construction. Kawagane is harder and more refined than the shingane (core steel) it wraps, providing the surface for polishing, the hamon display, and the cutting edge.
The practice jacket worn in Japanese martial arts training – a heavy cotton wrap-front jacket, typically dark blue or white. Worn with hakama (wide trousers) in Kendo, Iaido, and Kenjutsu.
The Way of the Sword – the modern competitive Japanese sword art using shinai (bamboo swords) and bogu (protective armour). Governed by the International Kendo Federation with approximately eight million practitioners globally.
The Art of the Sword – the classical Japanese sword disciplines, specifically the koryu (old schools) that predate Kendo. Each school preserves a distinct technical tradition transmitted through kata.
Spirit shout – the vocal expression of focused intent at the moment of striking. In Kendo, kiai is a requirement for scoring: a valid ippon must be accompanied by appropriate spirit expression.
The fundamental downward cut in Iaido and Kendo – a vertical strike from above the head straight down to the target. Considered the most important single technique in Japanese sword arts.
The tip or point of the blade – the section beyond the yokote line. Kissaki shape and size is a major classification feature: ko-kissaki (small), chu-kissaki (medium), and o-kissaki (large).
Short sword – a blade shorter than the tachi but longer than a tanto. In Kendo the kodachi (shorter wooden sword) is used in the Nihon Kendo Kata alongside the long sword.
The mouth of the scabbard (saya) – the opening through which the blade enters. The koiguchi is typically reinforced with horn or metal and fitted closely to the habaki to create friction.
Old school or classical tradition – a Japanese martial arts lineage predating the Meiji Restoration (1868). Koryu schools preserve premodern combat systems largely unchanged and transmit them through personal instruction and kata.
1) The padded gauntlet protecting the forearm and wrist in Kendo bogu. 2) A valid scoring target in Kendo: a strike to the wrist/forearm. Kote is the smallest and fastest-to-reach target in Kendo.
Paired sword practice – formal partner kata using bokken or iaito. In Iaido schools, kumitachi reveals the combat logic behind solo kata and is typically taught only to advanced students.
The small knob on the outer face of the saya (scabbard), through which the sageo (suspension cord) passes. The kurikata’s position on the saya is used to orient the scabbard when worn in the belt.
Combative distance – the spatial and temporal relationship between two practitioners that governs when attacks and defences are possible. Maai is one of the most fundamental concepts in Japanese sword arts.
The swordsmith’s signature, filed into the nakago (tang). Mei may include the smith’s name, province, workshop, date, and dedication inscription. Reading and authenticating mei is a specialised study.
The small bamboo (or rarely horn) pin that passes through the tsuka (handle) and the nakago, securing the blade to the handle. Mekugi must be intact before any use of a sword.
1) The head and face protector in Kendo bogu. 2) A valid scoring target in Kendo: a strike to the top of the men. Men-strike is the most fundamental and valued technique in Kendo.
Complete transmission certificate – the highest licence in a classical Japanese martial arts school, signifying that the holder has received the full curriculum and is authorised to teach the tradition independently.
Irregular hamon – any temper line with unpredictable variation rather than a repeating pattern. Midare encompasses a wide range: ko-midare (small), gunome-midare (irregular waves), and tobiyaki (isolated detached patches).
Silent meditation performed at the beginning and end of training sessions. Practitioners kneel in seiza, close their eyes, and still the mind. Mokuso is observed across nearly all Japanese martial arts.
The effective striking zone of the blade – approximately the forward third closest to the kissaki. In Kendo, only strikes made with the monouchi count toward ippon scoring.
The spine or back of the blade – the side opposite the cutting edge (ha). Mune cross-section shapes vary by period and school: iori-mune (ridged), maru-mune (rounded), kaku-mune (square).
One of the two most widely practiced classical Iaido schools internationally. Traces lineage to Hayashizaki Jinsuke Shigenobu (late 16th century). Distinguished from Muso Shinden-ryu by specific technical interpretations in drawing mechanics, chiburi, and noto.
One of the two most widely practiced classical Iaido schools internationally. Also traces lineage to Hayashizaki. The school has significant international presence, particularly in Europe and North America.
Blade length – measured from the munemachi (spine notch) to the kissaki (tip) along the curvature of the spine. Standard katana nagasa: 60-75 cm. Wakizashi: 30-60 cm. Tanto: under 30 cm.
A curved blade mounted on a long pole – Japan’s primary polearm. Historically used extensively by warrior monks and cavalry. Modern Atarashii Naginata is a competitive sport with its own federation.
The tang – the unpolished portion of the blade that fits inside the tsuka (handle). The nakago carries the smith’s mei (signature) and date. Its shape, file-work pattern, and oxidation level are important authentication indicators.
The Society for Preservation of Japanese Art Swords – the principal Japanese body for sword authentication and preservation. Issues formal papers at several levels: Hozon, Tokubetsu Hozon, Juyo Token, Tokubetsu Juyo, up to Kokuho (National Treasure).
Coarse martensite crystals visible in and around the hamon as bright, sparkling points under directional light – like stars in the temper line. Abundant, clear nie is highly valued and associated with Soshu and certain Bizen-tradition blades.
Japanese sword – specifically an authentic sword made in Japan by a traditionally trained swordsmith using tamahagane, following classical techniques. Nihonto are registered cultural objects in Japan; production is regulated.
Fine, misty martensite activity in the hamon – appearing as a soft, luminous band rather than distinct crystals. A hamon described as ‘nioi-deki’ has predominantly nioi character; ‘nie-deki’ has predominantly coarse nie.
Two Heavens as One School – the classical kenjutsu school founded by Miyamoto Musashi (c.1584-1645), centred on simultaneous use of katana and wakizashi (nito). Active transmission continues from Kumamoto.
Field sword / great sword – a very long Japanese sword (nagasa over 90 cm) used on the battlefield for fighting mounted opponents. Too long for normal waist-wear; carried on the back or by an attendant.
Gently undulating hamon – a pattern of long, slow waves along the temper line. Notare is associated with Soshu-tradition blades (Masamune, Sadamune) and is considered one of the most elegant hamon types.
Resheathing the sword – the act of returning the blade to the saya after cutting, performed at the conclusion of each Iaido kata. Correct noto requires guiding the kissaki into the koiguchi without looking down.
The drawing cut – the initial cutting stroke performed simultaneously with drawing the blade from the saya. The nukitsuke is the defining technique of Iaido: achieving maximum speed, reach, and cutting effect in the instant of drawing.
Free practice – unscripted sparring between practitioners, as opposed to kata (fixed forms). In Kendo, randori (also called keiko or jigeiko) is central to training: applying techniques under genuine resistance.
The bow – the fundamental gesture of respect in Japanese martial arts. Performed at dojo entry and exit, at the start and end of practice, and before and after each match or partner exercise.
Formal etiquette – the complete body of behavioural protocols in the dojo: how to enter, address seniors, handle weapons, wear equipment, and conduct oneself during training.
School or tradition – a martial arts lineage with a specific founder, curriculum, and transmission history. A ryu is a formal organisational entity with documented lineage from teacher to student.
Ray skin – the rough, pebbly skin of a ray (typically stingray) used to wrap the handle core beneath the ito wrapping. Same provides excellent grip, resists moisture, and is the traditional handle covering for nihonto.
The scabbard – the wooden sheath that protects the blade when not in use. Made from magnolia wood (honoki) in traditional construction. Saya fittings include kurikata (cord knob), koiguchi (mouth), and kojiri (tip cap).
Pressure – the quality of threatening intent projected toward the opponent before a physical attack occurs. Seme forces the opponent to react defensively, creating openings. High-level Kendo is often described as a contest of seme.
Teacher – used to address a martial arts instructor. Literally ‘one who has gone before’. In dojo context typically used for qualified instructors; ‘Sensei’ replaces the person’s name when addressing them.
A pair of thin metal washers placed on either side of the tsuba (guard) to fill the gap between the guard and habaki, preventing rattle. Their thickness must be correct for safe assembly.
Core steel in laminated blade construction – the softer, more ductile steel that forms the inner body of the blade. Shingane absorbs impact and prevents catastrophic fracture while the harder kawagane provides the cutting edge.
Bamboo practice sword used in Kendo for full-contact sparring. Constructed from four tapered bamboo staves bound with leather fittings. Regular inspection for cracked staves is essential – a splintered shinai can cause serious injury.
New Shadow School – one of the most historically influential kenjutsu traditions, founded by Kamiizumi Nobutsuna (16th century). The school introduced the fukuro shinai for safe partner practice and developed sophisticated theory around mushin (no-mind).
The ridge line running lengthwise along the blade – the demarcation between the ji (lower flat) and the shinogi-ji (upper flat near the spine). Shinogi-zukuri is the most common blade geometry in Japanese swords.
The curvature of the blade – measured as the maximum perpendicular distance from a straight line connecting tip to base of the spine. Sori type is a primary dating indicator: koshi-zori (curve near base), torii-zori (even curve), saki-zori (curve near tip).
Solo cutting practice – swinging the sword (or bokken) through prescribed cutting arcs without a target or partner. Suburi develops correct cutting mechanics and builds the specific muscle patterns of sword use.
Straight hamon – a temper line that runs parallel to the edge with minimal deviation. Suguha is associated with Yamato-tradition schools and is technically demanding: small variations in an ostensibly straight line are immediately visible.
The early Japanese long sword, predating the katana. Tachi are longer and more deeply curved than katana and were worn suspended from the belt edge-down. Associated with mounted warfare.
Jewel steel – the traditional steel produced in the Japanese tatara (smelting furnace) from iron sand (satetsu). Its specific grain and character cannot be replicated in modern steel.
Test cutting – using a live blade to cut physical targets to evaluate both the sword’s performance and the practitioner’s technique. Modern targets include tatami omote (rolled reed mats) and bamboo.
A blade under 30 cm in nagasa – a Japanese dagger or knife. Many tanto are among the most technically accomplished Japanese blades; Masamune’s tanto are considered among the finest Japanese swords of any length.
The waist and upper hip protector in Kendo bogu – a series of padded flaps suspended from a broad belt. The tare protects against low strikes and provides a surface for the practitioner’s name tag.
The traditional Japanese smelting furnace used to produce tamahagane from iron sand (satetsu) and charcoal. A tatara operation takes three days and nights of continuous firing. The technique is maintained today by the NBTHK.
Isolated patches of hardening that appear separate from the main hamon – ‘flying sparks’ of temper activity above the temper line. Tobiyaki appears in hitatsura blades and in some irregular midare hamon.
The hand guard – the disc or shaped fitting between the blade and handle. Tsuba are a major category of Japanese decorative metalwork; collector tsuba are made in iron, shakudo, and various alloys in every imaginable design.
The handle or hilt of the sword. Constructed from two shaped pieces of wood fitted to the nakago, covered with same (ray skin), and wrapped with ito (cord). The tsuka’s length and wrap pattern are both functional and aesthetic choices.
Clay application – the process of applying a specific clay mixture to the blade surface before the hardening quench. Areas coated thickly cool slowly, remaining soft; areas coated thinly (near the edge) cool rapidly, hardening. The clay pattern creates the hamon’s shape.
Blade-locking – close-quarters pushing and jostling with shinai guards pressed together, occurring when two Kendo practitioners close distance past effective striking range.
A silk-wrapped ball of fine polishing powder, tapped along the blade surface to deposit a thin layer of powder for cleaning and light polishing. Used in routine blade maintenance alongside nuguigami and choji oil.
Early term for what became the katana – a sword worn edge-up in the belt rather than suspended edge-down like the tachi. Uchigatana emerged in the late Muromachi period (15th-16th century).
The companion sword – worn paired with the katana as the daisho (long-short pair) by samurai of the Edo period. Blade length 30-60 cm. Also used as the short sword in Niten Ichi-ryu two-sword practice.
Side guard – a stance with the sword held low and behind the body, tip pointing to the rear. Waki no kamae conceals the sword length from the opponent, making distance judgement difficult.
The hardened edge zone – the entire region of the blade that has been through the differential hardening process, including both the hamon (the visible boundary line) and the ha (cutting edge proper).
The branch of Shinkage-ryu transmitted through the Yagyu clan, official sword instructors to the Tokugawa shogunate. Yagyu Munenori’s Heiho Kadensho (The Life-Giving Sword) integrates Zen philosophy into sword practice theory.
The line on the blade surface that separates the main blade body from the kissaki (tip section). The yokote runs perpendicular to the shinogi and ha, creating a clearly defined tip geometry.
Remaining heart/mind – the sustained awareness and readiness maintained after completing a technique. In Kendo, zanshin is a scoring criterion: a valid ippon requires the practitioner to maintain correct posture and mental alertness after the strike.