(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.

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

plural of Penrose triangle

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

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

plural of pink triangle

plural of purple triangle

A small American spider (Hyptiotes cavatus) that lives among the dead branches of evergreen trees. It constructs a triangular web, or net, usually composed of four radii crossed by a double elastic fiber. The spider holds the thread at the apex of the web and stretches it tight, but lets go and springs the net when an insect comes in contact with it.

(slang) A homosexual.

A region of Thailand, Laos, Myanmar, famous for production of opium and heroin. / A region of Victoria, Australia, where the Victorian Gold Rush occurred.