This character is a Nonspacing Mark and inherits its script property from the preceding character.
The glyph is not a composition. Its width in East Asian texts is determined by its context. It can be displayed wide or narrow. In bidirectional text it acts as Nonspacing Mark. When changing direction it is not mirrored. U+0325 prohibits a line break before it. The glyph can be confused with 2 other glyphs.
The Wikipedia has the following information about this codepoint:
A ring diacritic may appear above or below letters. It may be combined with some letters of the extended Latin alphabets in various contexts.