Circle symbol

Circle symbol may refer to (in ascending order of size, approximately):
 * ˚|˚, ring diacritic
 * ◦|◦, white bullet
 * ∘|∘, function composition
 * °|°, degree symbol
 * º|º, masculine ordinal indicator
 * , music symbol denoting either a diminished triad or diminished seventh chord
 * o, superscript lowercase letter o
 * ○|○, white circle Unicode symbol
 * ◌|◌, dotted circle
 * o|oοо|о, lowercase vowel letters in the Latin, Greek (omicron), and Cyrillic alphabets
 * 𐤏, Semitic/Phoenician letter Ayin, the ancestor of the Greek, Latin, Cyrillic etc. letters
 * O|OΟ|ΟО|О, uppercase vowel letters in the Latin, Greek, and Cyrillic alphabets
 * ⭘|⭘, heavy circle Unicode symbol
 * ◯|◯, O mark, large circle Unicode symbol

Unicode
Unicode provides various circle symbols: