Wu (hiragana: π, katakana: π’) is a hentaigana, a variant kana or Japanese syllable.
History
It is presumed that π would have represented . Along with π and π (yi and ye respectively), the syllable wu has no officially recognized kana, as these syllables do not occur in native Japanese words; however, during the Meiji period, linguists almost unanimously agreed on the kana for yi, ye, and wu. π and wu are thought to have never occurred as syllables in Japanese, and π was merged with γ and γ¨.
Characters
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. π and π’ were just two of many shapes.
They were phonetic symbols to fill in the blanks of the gojuon table. Japanese people didn't separate them in normal writing.
u
Traditional kana
γ (Hiragana) π (Hentaigana of γ. Hiragana.) π (Hentaigana of γ. Hiragana.) γ¦ (Katakana) Constructed kana (A part of ε΄. Katakana.)
wu
Traditional kana
γ (Hiragana) π (Hentaigana of γ. Hiragana.) γ¦ (Katakana) π’ (An old variant form of γ¦. Katakana.) Constructed kana γγ»(γ with dots. Hiragana.) π (A cursive script style of ζ±. Hiragana.) (A cursive script style of η΄. Hiragana.) (A cursive script style of θΏ. Hiragana,) (A cursive script style of ε―. Hiragana.) γ¦γ»(γ¦ with dots. Katakana.)
These suggestions weren't accepted.
Unicode
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).
Notes
References
See also
Yi (kana) Ye (kana)