Canonical Combining Class - CCC91

CCC91 is a specific value assigned to certain characters, indicating that they combine with preceding base characters in a way that requires a high, but not maximal, level of reordering during text normalization. It applies to marks that attach above or below the base, such as some diacritical signs used in Indic scripts, where the combining position is contextually determined. This value ensures that sequences involving these marks are processed in a stable, predictable order, preventing ambiguity when multiple combining characters are present. In practical terms, CCC91 characters are treated as having a fixed combining class that influences how they interact with adjacent marks, but it does not force the same strict ordering as higher classes like those for Hebrew or Arabic points.