Canonical Combining Class - CCC17

CCC17 is a specific value within the classification of character behavior during text normalization, indicating that a character has a fixed, non-zero combining class. This value assigns a particular priority to marks like certain diacritics, ensuring they are ordered relative to other combining characters when multiple marks attach to a base letter. Unlike classes that allow reordering, CCC17 forces a strict sequence, which matters for languages with complex stacking or when preserving visual order is critical. It reflects a historical or linguistic decision to keep certain marks in a stable position, often used for characters that must not be repositioned even if other marks are present.