Yes Value in Modifier Combining Mark Unicode Property

Yes is a classification indicating that a character functions as a spacing or nonspacing mark that combines with a preceding base character to modify its pronunciation, tone, or meaning, without being an independent grapheme. These marks include diacritics, vowel signs, and tone markers, and they do not initiate a new cluster; instead, they attach to the base, altering its phonetic value or grammatical function. The "Yes" value specifically confirms that the character is designed for such modification, and it implies that the mark is not a letter, number, or standalone symbol on its own. This applies to characters that are typically invisible or small, and their placement, shape, or appearance changes depending on the base they follow, ensuring proper rendering in complex scripts.