See: Triangle Isis, Horus and Seth Triad of Lucifer
A Hexagram is 3 triangles.
Symbol on the outside of the old Sheffield Masonic Hall, Surrey Street, Sheffield.
Valknutr (" knot of the deceaseds ") is a funeral symbol placed on runic stones to help the deceaseds to join Walhalla.
Gold plated Masonic earrings
Royal Ark Mariner Grand Officers Apron Triangles (set of 3)