Triangle

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The Triangle is a simple steel rod, bent into the shape for which it is named. Although the triangle is among the smallest of orchestral instruments, it has a very clear, tinkling sound that cuts through even very loud music. The triangle does not have a distinct pitch ; its tone quality varies according to where, and how hard, you strike it.

Family
Percussions
Pitch range
None.
Material
Steel.
Size
The triangle-shaped rod is approximately 0.5 in (1 cm) in diameter ; each side of the triangle can be from about 4-10 in (10-25 cm) long.
Origins
The triangle developed in Europe from an ancient metal rattle called the sistrum, which was played in ancient Egypt, and is still used in Ethiopia today.
Classification
Idiophone: an instrument that produces its sound through the use of the material from which it is made, without needing strings or a stretched skin.
And also...
Very large triangles are occasionally employed as fire-warning devices in some parts of Europe and the United States.

picture of Triangle