Other Grapheme Extend - Yes
Yes is a specific value that signals a character acts as an invisible extension to a preceding grapheme, meaning it does not start a new visual unit but combines with the base character to form a single, cohesive syllable or symbol. This applies to combining marks like diacritics, vowel signs in Indic scripts, and other spacing or nonspacing modifiers that alter pronunciation or shape, such as the Arabic tatweel or variation selectors. A codepoint with this value is treated as part of the same grapheme cluster, so it cannot be independently selected, moved, or broken across lines, ensuring that complex text rendering, cursor movement, and editing operations treat the entire cluster as one indivisible unit. This behavior is crucial for proper display of languages like Thai, Hebrew, or Devanagari, where multiple characters often form a single logical character.