Grapheme Extend - Yes

Yes is the designation for characters that visually attach to or modify the preceding base character within a grapheme cluster, without starting a new cluster themselves. These include combining marks (like accents, diacritics, and vowel signs), zero-width joiners, and certain spacing combining marks that extend the tail of a base glyph. When a character has this value, it means that when processing text, it must be grouped with the character before it, so that the pair or sequence forms a single user-perceived unit. This prevents line breaks, cursor movements, or selections from splitting the cluster, preserving the integrity of scripts like Devanagari, Arabic, or Hangul, where multiple components combine into one visual symbol.