Mu (hiragana: ãÂÂ, katakana: ã ) is one of the Japanese kana, which each represent one mora. The hiragana is written with three strokes, while the katakana is written with two. Both represent .
In older Japanese texts until the spelling reforms of 1900, ã was also used to transcribe the nasalized . Since the reforms, it is replaced in such positions with ãÂÂ.
In the Ainu language, ã can be written as small ãº, which represents a final m sound. This, along with other extended katakana, was developed by Japanese linguists to represent Ainu sounds that do not exist in standard Japanese katakana.