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

Small combining form of katakana イ (i) used to explicitly specify the vowel part of the previous katakana character, or to show a speaker's pronunciation or extension of that vowel.

items that come in pairs / sets of furniture etc.

bureau

facing, opposed / pair, duo, dyad

versus

鯛: sea bream

Short for ネクタイ (nekutai, “necktie”); a tie / (music) tie (symbol)

Thailand

須佐之男: Susanoo, the Japanese god of storms