In geometry, a triangle is a closed, two-dimensional shape with three straight sides. A triangle is also a polygon.

What does △ mean?

Symbol. △ (geometry) A triangle.

What does a triangle symbolize in math?

triangle Indicates a small change, Denotes vertices of triangle. m = y / x.

In most literary pieces, the triangle (with the number three) repersents perfectness, unity, and importance. It is the strongest unit. When a group/item in literature moves from three, the traingle, to four, it foreshadows bad things and destruction.