Canonical Combining Class - CCC130

CCC130 is a specific numeric value assigned to a character that indicates a high‑level combining relationship in text processing. It denotes a class where the character participates in canonical ordering but is not attached to the base character in a simple way; instead, it is used for marks that are positioned above or below the base, often in complex scripts. Characters with this value are treated as having a fixed position in the combining sequence, meaning they do not reorder with other marks of the same class, but they do reorder relative to marks with lower or higher values. This ensures consistent rendering and normalization when multiple diacritical marks are stacked, preserving the intended visual and semantic order. In practical terms, CCC130 helps software decide how to sort and display combining characters, particularly for vowels and tone marks in languages like Thai or Vietnamese, where precise stacking matters.