A fractal consisting of three copies of itself, shrunk to half size, arranged in a triangular shape without rotating.

An optical illusion depicting an impossible solid object made of three straight beams of square cross section which meet pairwise at right angles at the vertices of the triangle they form.

plural of acute triangle

plural of love triangle

plural of equilateral triangle

plural of isosceles triangle

An area of about 200 square miles (520 sq km) in southeastern Massachusetts, United States, claimed to be the site of various paranormal phenomena.

(anatomy) The femoral triangle.

Synonym of fire triangle

The three elements necessary and sufficient to sustain a fire: fuel (e.g. wood or petrol/gasoline), oxidizer (e.g. oxygen), and sufficient heat (e.g. reaction temperature or activation energy).