Halfwidth Katakana Letter Ka

ｶ is the same katakana “ka” as カ, in a narrow compatibility form. Unicode maps it to カ for compatibility; the font determines how either character looks on screen.

This form developed through Japanese character encodings. A 7-bit JIS C 6220 prototype appeared in 1967. Its 8-bit successor, JIS X 0201, made ASCII and Japanese kana available in the same encoding. JIS X 0208 later included a separate, square form of the kana, and Shift JIS carried both sets. The earlier encoding form remains useful for compatibility and conversion.

“Halfwidth” describes a traditional display convention, not how many bytes the character must use. Encoding determines storage, while the font determines visible width.

Will ｶ work in a Japanese form?

Only if the field accepts half-width kana. Japanese systems have different rules: e-Gov guidance lists JIS X 0201 among accepted input characters, while a Ministry of Health style rule replaces half-width katakana with full-width forms.

If a field gives no special instruction, カ is the safer choice. Use ｶ when the field or data format explicitly requires the half-width form.