(anatomy) Calot's triangle

plural of triangle spider

(mathematics) A group that can be realized geometrically by sequences of reflections across the sides of a triangle.

plural of triangle group

A region of Central America consisting of Guatemala, El Salvador, and Honduras.

A space next to a solid object, which (according to a disputed theory) a person should occupy in order to reduce the risk of injury inside a collapsing building, e.g. during earthquake. The crushing of the solid object is said to form a slope that protects the nearby space in the manner of a roof.

A region bounded by the vertices at Reno, Nevada, USA; Las Vegas, Nevada, USA; Fresno, California, USA; containing part of the Sierra Nevadas (a mountain range in the Rocky Mountain Cordillera); the triangle falling mostly in the U.S. state of Nevada; where many plane crashes occur and planes disappear.

A region of Bolivia, Chile, Argentina, in the Atacama Desert, which produces much of the world's lithium supply, and contain most of the known world lithium reserves

A region of West Yorkshire, between Wakefield, Morley and Rothwell, famous for producing early forced rhubarb.

An area that is dangerous and where people or vessels may disappear. / A set of three things considered dangerous.