Changes When Uppercased - Yes
Yes is the designation for characters whose written form alters when converted to uppercase, meaning their lowercase or titlecase version is not simply a one-to-one mapping to a single uppercase code point. This includes characters like the German sharp s (ß), which becomes "SS" in uppercase, or the Greek final sigma (ς), which changes to a standard sigma (Σ). It also covers characters that undergo context-dependent or multi-character transformations, such as ligatures (fi to FI) or certain accented letters with distinct uppercase forms. In essence, "Yes" signals that a simple casing operation will produce a different sequence or glyph, requiring special handling in text processing, search, or display systems to ensure accurate case conversion.