Canonical Combining Class - CCC21

CCC21 is a specific numeric value, 21, that denotes the canonical combining class assigned to certain diacritical marks, specifically those categorized as “Above” attachments. In text processing, this value indicates that a combining character, such as a cedilla or a subscripted hook, is positioned above the base character it modifies, and it influences how the text is reordered during normalization. Characters with CCC21 are treated as combining marks with a high precedence for placement above the base glyph, meaning they are applied after most other combining marks that attach below or to the sides. This value helps software correctly render complex scripts and ensures consistent sorting and searching by defining a fixed order for combining characters that share the same base letter.