General Category - Letter

Letter is a fundamental classification for characters that function as alphabetic symbols, encompassing all letters across scripts, including uppercase, lowercase, and titlecase forms, as well as modifiers and other letterlike symbols. This category includes not only standard A to Z but also accented characters, non Latin scripts like Cyrillic or Arabic, and even letters used in phonetic notation. The value serves to distinguish true letters from numbers, punctuation, or symbols, enabling text processing tasks such as word detection, case conversion, and language aware sorting. By grouping letters together, it allows software to treat them uniformly regardless of script, which is essential for search, spell checking, and natural language processing. However, it deliberately excludes characters that look like letters but are defined as symbols or numbers, ensuring a clean semantic boundary for algorithmic use.