Triangle representing Holy Trinity. Three signifies completion or perfection, and unity. The number 3 is in the Bible many times. Plus I am obsessed with the symbol of the triangle. And Matthew Mole has a triangle tat!! The orientation of a triangle can be important to it's meaning. For example, a point-up triangle might represent a strong foundation or stability, as it is rooted to the ground through a solid base. Point-up triangles can also represent ascension toward the spiritual world.