Wu (hiragana: , katakana: ) is a Japanese mora or a kana used to write it, though it has never been in standard use.
It is presumed that would have represented . Along with and (yi and ye respectively), the mora wu has no officially recognized kana, as these morae do not occur in native Japanese words; however, during the Meiji period, linguists almost unanimously agreed on the kana for yi, ye, and wu. and wu are thought to have never occurred as morae in Japanese, and was merged with and .
In the Edo period and the Meiji period, some Japanese linguists tried to separate kana u and kana wu. The shapes of characters differed with each linguist. and were just two of many shapes.
They were phonetic symbols to fill in the blanks of the gojà «on table, but Japanese people did not separate them in normal writing.
These suggestions were not accepted.
This kana has been encoded into Unicode 14.0 since September 14, 2021 as HIRAGANA LETTER ARCHAIC WU (U+1B11F), and KATAKANA LETTER ARCHAIC WU (U+1B122).