U+FF9F "ﾟ" Halfwidth Katakana Semi-Voiced Sound Mark Unicode Character

U+FF9F "ﾟ" Halfwidth Katakana Semi-Voiced Sound Mark is a typographical symbol used primarily in Japanese writing to indicate a semi-voiced pronunciation, notably transforming the 'h' sound series into 'p' sounds (e.g., ハ to パ) when placed after a halfwidth katakana character. It represents a halfwidth version of the standard fullwidth handakuten (゜) and is encoded specifically for compatibility with legacy text systems and certain digital fonts that require a narrower character width. This character is part of the halfwidth katakana block in Unicode, which was developed to support older computer encoding standards like Shift JIS, allowing for efficient display in constrained terminal or monospaced environments without altering the inherent phonetic function of the mark.