Geometric shapes with three straight sides and three angles, or the percussion instrument that makes a ringing sound when struck.
From Latin 'triangulum' (tri- meaning 'three' + angulum meaning 'angle'). The word has been used since the 14th century for the mathematical shape, and later applied to the musical instrument.
Triangles are secretly the strongest shapes in construction and engineering—that's why bridges use triangular trusses instead of squares or rectangles! The ancient Romans discovered this, which is why so many old stone structures with triangular arches are still standing after 2,000 years.
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