General Category - Cased Letter

Cased Letter is a category for characters that inherently possess both an uppercase and a lowercase form, such as Latin, Greek, and Cyrillic letters. These characters change their shape depending on context, like at the start of a sentence or in all-caps text. The category includes three subcategories: uppercase letters (like 'A'), lowercase letters (like 'a'), and titlecase letters (like 'Dž', used in certain orthographies). Unlike uncased letters, such as those in Hebrew or Arabic, cased letters enable case mapping and folding operations, which are essential for sorting, searching, and text normalization. This classification applies only to single characters, not to sequences, and it excludes letters that have no case distinction. In essence, it defines the set of characters whose written form is morphologically tied to case.