Yes Value in Extender Unicode Property
Yes is the designation for characters that visually extend the shape or length of a preceding base character, typically without adding new semantic content. These include letters like the Arabic tatweel (ـ), the Japanese prolonged sound mark (ー), and various modifier letters or diacritic-like marks in scripts such as Devanagari, Hangul, and Ethiopic. Such characters are used to alter spacing, lengthen a vowel sound, or create a continuous stroke, and they are recognized for their role in phonetic transcription and text shaping, where they do not start a new word or syllable. The "Yes" value simply confirms that a given character fulfills this extending function, helping processors correctly handle ligatures, justification, and reading order. It does not cover punctuation or symbols that merely add width, but only those specifically designed to extend a prior glyph.