Sokuon

The sokuon (促音) is a Japanese symbol in the form of a small hiragana or katakana tsu. In less formal language it is called chiisai tsu (小さいつ) or chiisana tsu (小さなつ), meaning "small tsu".[1] It serves multiple purposes in Japanese writing.

Not to be confused with the Sukoun, an Arabic ring-shaped diacritic marking a mute consonant.
Japanese writing
Components
Kanji
Kana
Typographic
symbols
Uses
Syllabograms
Romanization
Rōmaji
kana gojūon
warayamahanatasakaa
wiri mihinichishikii
ruyumufunutsusukuu
were mehenetesekee
woroyomohonotosokoo
n

sokuon · dakuten · chōonpu

yori · koto · hentaigana

Appearance

In both hiragana and katakana, the sokuon appears as a tsu reduced in size:

Full-sized Sokuon
Hiragana つ っ
Katakana ツ ッ

Use in Japanese

The main use of the sokuon is to mark a geminate consonant,[1] which is represented in most romanization systems by the doubling of the consonant, except that Hepburn romanization, writes a geminate ch as tch. It denotes the gemination of the initial consonant of the kana that follows it.

Examples:

  • Pocky, a Japanese snack food, is written in kana as ポッキー, which is
    ポ po
    ッ (sokuon)
    キ ki
    ー (chōonpu)
    In rōmaji, this is written pokkī, with the sokuon represented by the doubled k consonant.
  • 待って (matte), the te form of the verb 待つ (matsu, "wait"), is composed of:
    待 ma (kanji)
    っ (sokuon)
    て te
    In the rōmaji rendering, matte, the sokuon is represented by the doubling of the t consonant.
  • こっち (kotchi), meaning "here", is composed of:
    こ ko
    っ (sokuon)
    ち chi
    In Hepburn romanization, kotchi, the sokuon is represented by the t consonant, even though the following consonant is ch. This is because rōmaji ch actually represents [t͡ɕ] (voiceless alveolo-palatal affricate), and the sokuon before it doubles the [t] sound. The Kunrei-shiki and Nihon-shiki romanization systems write this syllable as ti (and its geminate version as tti) so the exception does not arise.

The sokuon usually cannot appear at the beginning of a word, before a vowel kana (a, i, u, e, or o), or before kana that begin with the consonants n, m, r, w, or y (in words and loanwords that require geminating these consonants, ン, ム, ル, ウ, and イ are used respectively instead of the sokuon). In addition, it does not appear before voiced consonants (g, z, d, or b), or before h, except in loanwords, or distorted speech, or dialects. However, uncommon exceptions exist for stylistic reasons: For example, the Japanese name of the character Cramorant from the Pokémon franchise is ウッウ, pronounced /u'u/.[2]

The sokuon is also used at the end of a sentence, to indicate a glottal stop (IPA [ʔ], a sharp or cut-off articulation),[3] which may indicate angry or surprised speech. This pronunciation is also used for exceptions mentioned before (e.g. a sokuon before a vowel kana). There is no standard way of romanizing the sokuon that is at the end of a sentence. In English writing, this is often rendered as an em dash. Other conventions are to render it as t or as an apostrophe.

In the International Phonetic Alphabet, the sokuon is transcribed with either a colon-like length mark or a doubled consonant:

  • kite (来て, "come") – /kite/
  • kitte (切手, "postage stamp") – /kitːe/ or /kitte/
  • asari (あさり, "clams") – /asaɾi/
  • assari (あっさり, "easily") – /asːaɾi/ or /assaɾi/

The sokuon represents a mora, thus for example the word Nippon (Japan) consists of only two syllables, but four morae: ni-p-po-n.[4]

Use in other languages

In addition to Japanese, sokuon is used in Okinawan katakana orthographies. Ainu katakana uses a small ッ both for a final t-sound and to represent a sokuon (there is no ambiguity however, as gemination is allophonic with syllable-final t).

Computer input

There are several methods of entering the sokuon using a computer or word-processor, such as xtu, ltu, ltsu, etc. Some systems, such as Kotoeri for macOS and the Microsoft IME, generate a sokuon if an applicable consonant letter is typed twice; for example tta generates った.

Other representations

Braille:

Character information
Previewっッｯ
Unicode nameHIRAGANA LETTER SMALL TUKATAKANA LETTER SMALL TUHALFWIDTH KATAKANA LETTER SMALL TU
Encodingsdecimalhexdecimalhexdecimalhex
Unicode12387U+306312483U+30C365391U+FF6F
UTF-8227 129 163E3 81 A3227 131 131E3 83 83239 189 175EF BD AF
GB 18030164 195A4 C3165 195A5 C3132 49 151 4984 31 97 31
Numeric character referenceっっッッｯｯ
Shift JIS[5]130 19382 C1131 9883 62175AF
EUC-JP[6]164 195A4 C3165 195A5 C3142 1758E AF
EUC-KR[7] / UHC[8]170 195AA C3171 195AB C3
Big5 (non-ETEN kana)[9]198 199C6 C7199 91C7 5B
Big5 (ETEN / HKSCS)[10]199 74C7 4A199 191C7 BF

References
  1. Kawahara, Shigeto. "The phonetics of obstruent geminates, sokuon" (PDF). Semantic Scholar. Retrieved 2019-06-28.
  2. The pronunciation is verifiable here: Nintendo Direct (September 5, 2019; 23 min 48 s). Retrieved 2019-09-05.
  3. "What is that small tsu at the end of a sentence?". sljfaq.org. Retrieved 2019-06-28.
  4. Nick Miller, Anja Lowit (2014). Motor Speech Disorders: A Cross-Language Perspective. Multilingual Matters. p. 223. ISBN 9781783092321.
  5. Unicode Consortium (2015-12-02) [1994-03-08]. "Shift-JIS to Unicode".
  6. Unicode Consortium; IBM. "EUC-JP-2007". International Components for Unicode.
  7. Unicode Consortium; IBM. "IBM-970". International Components for Unicode.
  8. Steele, Shawn (2000). "cp949 to Unicode table". Microsoft / Unicode Consortium.
  9. Unicode Consortium (2015-12-02) [1994-02-11]. "BIG5 to Unicode table (complete)".
  10. van Kesteren, Anne. "big5". Encoding Standard. WHATWG.
  • Fujihiko Kaneda, Rika Samidori (1989). Easy hiragana: first steps to reading and writing basic Japanese. Passport Books. pp. 74−78.

See also
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