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The sokuon () is a Japanese symbol in the form of a small hiragana or katakana tsu. In less formal language it is called chiisai tsu (?) or chiisana tsu (?), meaning "little tsu". Compare to a full-sized tsu:
The sokuon is used for various purposes. The main use is to mark a geminate consonant, which is represented in r?maji (romanized Japanese) by the doubling of the consonant (except when the following consonant is ch). It denotes the gemination of the initial consonant of the kana that follows it.
The sokuon 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, ?, ?, ?, ?, and ? 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.
The sokuon is also used at the end of a sentence, to indicate a glottal stop (IPA [?], a sharp or cut-off articulation), which may indicate angry or surprised speech. There is no standard way of romanizing the sokuon that is at the end of a sentence. In English writing,[clarification needed] 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:
In addition to Japanese, sokuon is used in Okinawan katakana orthographies. Ainu katakana uses a small ? both for a final t-sound and to represent a sokuon (there is no ambiguity however, as gemination is allophonic with syllable-final t).
There are several methods of entering the sokuon using a computer or word-processor, such as
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 .
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