Canonical Combining Class - Not Reordered
Not Reordered is the default value for the canonical combining class, designated as 0, indicating that a character carries no combining mark that would attach to a preceding base character. This means the character does not interact with adjacent characters for diacritic stacking or reordering during normalization, so its position remains fixed in the text sequence. It applies to most characters, including letters, digits, punctuation, and spacing marks, ensuring they are treated as independent units that do not alter the visual or semantic ordering of surrounding glyphs. In contrast to nonzero values that dictate specific combining behaviors, this neutral setting allows for straightforward processing in text rendering and collation, as it signals that no special positioning or cascade rules are required for the character.