Percussion
The music triangle symbol in musical notation represents a percussion instrument called a triangle. It is used to indicate when a musician should play the triangle in a musical piece. The triangle adds a unique sound and texture to the music, enhancing the overall composition.
Pardon? Its shape is certainly geometrical, usually an equilateral triangle.
group (musical), or "musical group"
it was a musical group. ====))))))
A triangle as in a musical instrument
because it has an opening on one of its angles
Triangle Group - company - was created in 1976.
musical group = band barred = banned
Baskervilles - musical group - was created in 1997.
N.A.S.A. - musical group - was created in 2004.
Pandora - musical group - was created in 1980.
No, some early musical triangles were isosceles triangles, most modern musical triangles are equilateral.