triangle
basic three-sided shape of geometry
central triangle
triangle related to a given triangle by two functions
pink triangle
badge used in Nazi concentration camps to identify homosexual men and transgender women prisoners, later revived in the 1970s as a symbol of protest against homophobia and adopted as a symbol of LGBTQ pride and queer liberation
Bermuda Triangle
region in the western part of the North Atlantic Ocean between Florida, Bermuda and Puerto Rico
acute or obtuse triangle
triangle without a right angle
oblique triangle
triangle that is not orthogonal
integer triangle
triangle with integer side lengths
circular triangle
triangle with circular arc edges
isosceles triangle
triangle with two sides congruent and two angles equal