[1] U+030A COMBINING RING ABOVE (̊) - Charinfo (2016-12-31 10:58:21 +09:00) https://chars.suikawiki.org/char/030A

• [164] The Unicode Standard, Version 13.0 - ch07.pdf, 2020-03-09T17:53:38.000Z, 2020-12-07T09:15:13.901Z https://www.unicode.org/versions/latest/ch07.pdf#M9.37081.HeadingBreak.79.Combining.Marks