The symbol in the International Phonetic Alphabet that represents this sound is ⟨ɘ⟩.
The letter ⟨ɘ⟩ may be used with a lowering diacritic ⟨ɘ̞⟩, to denote the mid central unrounded vowel.
Conversely, ⟨ə⟩, the symbol for the mid central vowel may be used with a raising diacritic ⟨ə̝⟩ to denote the close-mid central unrounded vowel, although that is more accurately written with an additional unrounding diacritic ⟨ə̝͑⟩ to explicitly denote the lack of rounding (the canonical value of IPA ⟨ə⟩ is undefined for rounding).
Symbols to the right in a cell are voiced, to the left are voiceless.
Shaded areas denote articulations judged impossible.