U+01D6 "ǖ" Latin Small Letter U with Diaeresis and Macron Unicode Character

U+01D6 "ǖ" Latin Small Letter U with Diaeresis and Macron is a composite glyph used primarily in the Pinyin romanization system for Mandarin Chinese to represent the high level tone of the vowel "ü", which itself denotes the close front rounded vowel sound. This character combines a Latin small letter u with a diaeresis (the two dots above) and a macron (a horizontal line above the dots), the diaeresis distinguishing the vowel from a plain "u" in contexts like "nǖ" versus "nu", while the macron indicates the first tone. It is coded separately in Unicode to allow straightforward representation of this tonal variant in digital text, avoiding the need for combining diacritical marks, and it finds use in linguistic texts, language learning materials, and any system requiring precise phonetic transcription of Standard Chinese.