(anatomy) An anatomic space bordered by the common hepatic duct, the cystic duct and base of the liver. It is used to identify the cystic artery.

(mathematics, engineering) A function or waveform that alternately ramps linearly upwards and then downwards.

plural of triangle wave

plural of Penrose triangle

(idiomatic) A relationship involving three persons (usually two women and one man or two men and one woman) among whom there are conflicting and competing attachments of a romantic or emotional nature.

(US politics, political science) The policy-making relationship among the congressional committees, the bureaucracy (executive, sometimes called “government agencies”), and interest groups or lobbyists.

(historical) A key communist Chinese and North Korean concentration area and communications junction during the Korean War, located in the central sector.

plural of purple triangle

plural of pink triangle

(derogatory, dated) A Jehovah's Witness. / (historical) A Jehovah's Witness in Nazi Germany.