vocal trio

a trilobite

(historical) the "three talents": sky (天), earth (地) and people (人) (one who knows all three well would be an all-rounded person) / (figuratively) everything in the universe; all of creation

a surname

Kyūjitai form of 大日本帝国: Empire of Japan

(military, historical) the Imperial Japanese Army

(military, historical) the Imperial Japanese Navy

(history) the twelve 律令 (ritsuryō) positions inside the Japanese imperial seraglio

a tridecagon

(mahjong) little three dragons: a 役 (yaku, “hand”) with triplets or quads of two of the 三元牌 (sangenpai, “dragon tiles”), plus a pair of the third; worth 2 翻 (han, “doubles”). Because 2 翻 is added from the 役牌 (yakuhai, “meld of seat/prevailing wind or dragon”) of the two dragons, the total is actually 4 翻.