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Meaning of “triangle” in the English Dictionary

"triangle" in British English

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trianglenoun [C]

uk   /ˈtraɪ.æŋ.ɡəl/  us   /ˈtraɪ.æŋ.ɡəl/
B2 a flat shape with three straight sides: an equilateral/isosceles triangle
anything that has three straight sides: Which earrings did you buy in the end - the triangles or the circles?
a musical instrument consisting of a thin metal bar bent into a triangle shape that is hit with a metal bar to make a sound
US (UK set square) a flat piece of metal or plastic in the shape of a triangle with one angle of 90°, used for drawing angles
(also frame) a three-sided frame for arranging the balls at the start of a game of billiards, pool, etc.

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(Definition of triangle from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"triangle" in American English

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trianglenoun [C]

 us   /ˈtrɑɪˌæŋ·ɡəl/
mathematics a flat shape with three straight sides: Her earrings were in the shape of triangles.
music A triangle is also a musical instrument consisting of a thin metal bar having three sides, which makes a high sound when held up in the air and hit with a metal bar.
(Definition of triangle from the Cambridge Academic Content Dictionary © Cambridge University Press)
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