Three triangles also make up the eMagin logo.
There's a building near Calgary Trail here in Edmonton that has some office building with three triangles as a logo.
Both of these have their triangles arranged just like the TriForce often is...equilateral, and forming a larger triangle with their outside edges, and also an inverted triangle in the middle.
I hear it's based on some Japanese Shinto symbol.
THE TRIFORCE IS EVERYWHERE.