The hiragana syllable お (o). Its equivalent in katakana is オ (o). It is the fifth syllable in the gojūon order; its position is あ行お段 (a-gyō o-dan, “row a, section o”).

three-legged race / (idiomatic) cooperating and working together to accomplish a task

(chemistry) oxide (binary compound of oxygen)

calmly; quietly