Instructions:

Height: mid (close mid)
Backness: back
Rounded: unrounded

Note: Used as Cardinal Vowel No. 15.

Occurrence:
Alekano, Chinese (Mandarin, Taiwanese Hokkien), English (Received Pronunciation), Irish, Kaingang, Korean (Gyeongsang dialect), Önge, Scottish Gaelic, Sundanese, Thai.
(Source: https://en.wikipedia.org/wiki/Close-mid_back_unrounded_vowel#Occurrence)