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Triangle tattoos can stand for anything. Based on a philosophy, everything works in thirds: past, present, future. Perfection.
Also, triangles can stand for gender or sexuality (lesbian or gay). Downward is female, upward is male.
There are many differnet interpretations of the triangle tattoo, but it`s beauty of simplicity is endless.
Source link: http://www.tattoologist.com/2009/09/triangle.html