General Category - Spacing Mark
Spacing Mark is a character classification that denotes a mark which takes up horizontal space on its own, typically combining with a preceding base character without overlapping it. These marks are usually diacritical signs, such as vowels or tone indicators, that are placed after or beside the base letter, rather than stacked above or below it. Unlike non-spacing marks, which are zero-width, spacing marks advance the cursor position, meaning they occupy a distinct visual slot in the rendered text. Examples include certain modifiers in Indic scripts or the combining circumflex accent when applied to a character with a wide shape. This category helps software handle text shaping and cursor movement correctly, ensuring that these marks are treated as separate, visible components rather than invisible adjustments.