U+02C9 "ˉ" Modifier Letter Macron Unicode Character

U+02C9 "ˉ" Modifier Letter Macron is a small, horizontal line placed above a letter, used in linguistic and phonetic transcription to indicate a long vowel or a level tone, particularly in systems like the International Phonetic Alphabet or Pinyin romanization for Mandarin Chinese. It is distinct from the combining macron (U+0304), as this modifier letter stands alone and serves as a diacritic in typed or plain text contexts, often appearing before or after a character to modify its pronunciation without overlapping it. This character can also be found in transliterations of certain languages and in medieval manuscripts where it marked abbreviation or vowel length.