Its symbol in the International Phonetic Alphabet is ⟨ɤ⟩, called "ram's horn."
Before the 1989 IPA Convention, the symbol for the close-mid back unrounded vowel was ⟨⟩, sometimes called "baby gamma", which has a flat top; this symbol was in turn derived from and replaced the inverted small capital A, ⟨ᴀ⟩, that represented the sound before the 1928 revision to the IPA.
[3] The symbol was ultimately revised to be ⟨⟩, "ram's horn", with a rounded top, in order to better differentiate it from the Latin gamma ⟨ɣ⟩.
[4] Unicode provides U+0264 ɤ LATIN SMALL LETTER RAMS HORN, but in some fonts this character may appear as a "baby gamma" instead.
The superscript IPA version is U+10791 𐞑 MODIFIER LETTER SMALL RAMS HORN.