U+FF91 "ﾑ" Halfwidth Katakana Letter Mu Unicode Character

U+FF91 "ﾑ" Halfwidth Katakana Letter Mu is a narrow, halfwidth version of the standard fullwidth Katakana letter ム, which represents the syllable "mu." As part of the Halfwidth and Fullwidth Forms block in Unicode, it was designed primarily for compatibility with legacy character encodings and older computer systems that used a monospaced grid with a limited character width. Its usage has largely diminished in modern text, but it may still appear in contexts where preserving historical formatting or aligning with specific fixed-width character sets is necessary.