\vartriangleThe symbol \vartriangle is used to denote a triangular relationship or operation in mathematics. It is often used in geometry to represent a triangle or in set theory to denote symmetric difference between sets.
Symmetric difference between sets A and B
A \vartriangle BDenotes a triangle with vertices A, B, and C
\vartriangle ABCA binary operation or relation involving x and y, often used in abstract algebra or logic
x \vartriangle y