Cased

Cased is a binary character attribute that identifies whether a character has distinct uppercase, lowercase, or titlecase forms, as defined by the Unicode Standard. It applies to letters that change shape based on case, such as Latin, Greek, Cyrillic, and Armenian characters, but excludes caseless scripts like Arabic or Hebrew, as well as symbols, numbers, and punctuation. The property helps determine case mapping behavior, enabling operations like case folding and caseless matching, which are essential for searching, sorting, and text normalization in multilingual software. It also includes characters like the Greek final sigma, which has a contextual lowercase form, and certain modifier letters that exhibit case distinctions. By marking these characters, Cased facilitates consistent handling of text across different languages and platforms, ensuring that case-sensitive operations behave predictably and that case-insensitive comparisons work correctly for all applicable scripts.