The triangle is a three-sided geometric shape. Triangle has three sides and three corners. There are different types of triangles. A scalene triangle three sides are not equal and also the angles. The equilateral triangle which all the sides are equal and also the angles. An isosceles triangle has two sides equal in length and has two equal angles.
In Christianity, the triangle represents the holy trinity (father, son, and holy spirit). It has another meaning which is staging of the moon. In Celtic culture, the triangle is displayed in the form of the triquetra, triskelion as well as other trinity based on knotwork.
Greeks believe the triangle to be symbolic of a passage. The idea was that the combination of polarities would provide a new opening or doorway to higher wisdom.