トライアングル

noun

triangle (musical instrument)

Refers specifically to the percussion instrument, a metal bar bent into a triangle shape, struck with a beater.

• オーケストラでトライアングルを演えん奏そうする。

  I play the triangle in the orchestra.

noun

triangle (shape)

Refers to the geometric shape. The native Japanese word 三角形 is more common in everyday and formal contexts; トライアングル is used especially in casual or English-influenced settings, or in compound terms.