Sokuon
Japanese symbol / From Wikipedia, the free encyclopedia
Not to be confused with Sukūn , an Arabic ring-shaped diacritic marking a mute consonant.
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.