General Category - Modifier Letter
Modifier Letter is a classification for characters that function as letters but take on a modifying role, typically adjusting the sound or meaning of a preceding letter. These characters include small raised symbols, such as the feminine ordinal indicator (ª) or the masculine ordinal indicator (º), as well as phonetic extensions like ʰ or ʲ, which are used in linguistics to denote aspiration or palatalization. Unlike typical letters, they do not stand alone as full alphabetic units but rather attach conceptually to another letter, often in transcription systems or dictionary notations. They occupy a distinct niche in text processing, as they may require special handling for sorting, searching, or rendering, since their visual appearance and phonetic function differ from standard alphabetic characters. This category helps software and fonts correctly interpret and display these subtle but important written marks across various languages and scholarly works.