CCC28 Value in Canonical Combining Class Unicode Property

CCC28 is a specific canonical combining class value assigned to certain Unicode characters, indicating they are treated as combining marks with a fixed priority during text normalization. This value signifies that the character sits above the base character in a stacked or superscript position, such as some vowel signs or diacritics in scripts like Devanagari or Thai. In practice, CCC28 ensures these marks are reordered after characters with lower combining class values but before those with higher ones, preserving the intended visual order and linguistic meaning when composing or decomposing text. This precise ordering prevents ambiguity in rendering and searching, as it dictates the sequence in which combining characters are applied to a base glyph. Characters with CCC28 are not reordered relative to each other, maintaining their original code point order, which is crucial for consistent canonical equivalence across systems.