U+FF9C Halfwidth Katakana Letter Wa

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Wa (hiragana: わ, katakana: ワ) is one of the Japanese kana, which each represent one mora. The combination of a W-column kana letter with わ゙ in hiragana was introduced to represent [va] in the 19th century and 20th century. It represents [wa] and has origins in the character 和. There is also a small ゎ/ヮ, that is used to write the morae /kwa/ and /gwa/ (くゎ, ぐゎ), which are almost obsolete in contemporary standard Japanese but still exist in the Ryukyuan languages. A few loanword such as シークヮーサー(shiikwaasa from Okinawan language) and ムジカ・アンティクヮ・ケルン (Musica Antiqua Köln, German early music group) contains this letter in Japanese. Katakana ワ is also sometimes written with dakuten, ヷ, to represent a /va/ sound in foreign words; however, most IMEs lack a convenient way to write this. It is far more common to represent the /va/ sound with the digraph ヴァ.

The kana は (ha) is read as “wa” when it represents a particle.