U+01D1 "Ǒ" Latin Capital Letter O with Caron Unicode Character

U+01D1 "Ǒ" Latin Capital Letter O with Caron is a precomposed character in the Latin script that represents the letter O combined with a caron, or háček, which is a diacritical mark resembling an inverted breve. This character is used primarily in the transcription of certain tonal or phonetic systems, such as the International Phonetic Alphabet or romanization schemes for languages like Hmong or Mandarin Chinese, where the caron indicates a falling then rising tone. It appears less commonly than its lowercase counterpart, but facilitates unambiguous representation of this specific tonal contour in digital text. The character is encoded in the Unicode standard as a single codepoint for compatibility and ease of use with legacy character sets that supported precomposed forms.