Canonical Combining Class - CCC25

CCC25 is a specific numeric value assigned to certain characters, indicating that they belong to the 25th canonical combining class, which governs how they interact with preceding base characters during text normalization. This class is used for marks that attach above or below the base, such as some vowel signs in Indic scripts, and it dictates that these characters combine in a fixed, non-reorderable way, meaning they do not interact with adjacent combining marks of different classes. In practice, CCC25 ensures that the visual order and semantic identity of these characters remain stable when text is decomposed or recomposed, preventing unintended reordering during processes like sorting or searching. It is one of many such classes, each with a unique priority for combining behavior.