Canonical Combining Class - CCC15

CCC15 is a specific value within the numbering system that indicates how a character interacts with adjacent characters during text normalization. It denotes a fixed, non-zero class where the character is attached to the base character with a particular type of spacing or reordering restriction, specifically one that involves a canonical ordering behavior. Characters with CCC15 are typically marks or diacritics that must be positioned after certain other combining marks but before others, based on their numeric priority. This value ensures that when a sequence is decomposed and then recomposed, the order of these marks remains stable, preventing visual or semantic corruption in rendering. It applies to a narrow set of characters that share this precise placement rule, distinguishing them from other classes that allow more flexible reordering or have no defined relation. In practice, CCC15 helps maintain correct glyph stacking and linguistic meaning across various scripts.