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Wikipedia definition
1. Su (kana)す, in hiragana, or ス in katakana is one of the Japanese kana, each of which represents one mora. Their shapes come from the kanji 寸 and 須, respectively. Both kana represent the sound [su͍ su͍]. In the Ainu language, the katakana ス can be written as small ㇲ to represent a final s, and is used to emphasize the pronunciation of [s s] rather than the normal [ɕ ɕ] (represented in Ainu as ㇱ). * スィ and ズィ are also used to present si and zi pronunciations respectively.
Read “Su (kana)” on English Wikipedia
Read “す” on Japanese Wikipedia
Read “Su (kana)” on DBpedia

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