Triangle iron is an ancient percussion instrument that is essential in wind bands, orchestras, symphony orchestras, and even musical theater bands. Often adding performances to colorful sections to enhance the atmosphere. This instrument is made by bending thin steel bars and striking them with a metal rod. The sound has a short wavelength and a cool sound quality, making it suitable for simple rhythmic strikes. The metal rod can also be placed inside a triangular iron ring to rotate and play a "rolling" effect. Triangle iron is a military musical instrument of Türkiye, which was later introduced into Europe. In the 18th century, it was adopted by symphony orchestras, which used triangular iron with no fixed pitch. The sound of striking different parts of the triangle iron is slightly different, with the lowest sound on the long side and the higher sound on the short section of the isosceles. When playing the vibration sound, repeatedly and quickly strike the two sides of the corner, or draw a circle inside the triangle to strike the three sides.