 According to Carl G. Liungman's "Dictionary of Symbols", it combines the triangle meaning "threat" and the "Y" meaning a choice between good and evil.The dragon's eye resembles a two dimensional projection of a tetrahedron viewed from directly above one of its vertices.Such a 2-D representation has been part of the logo of the Citgo Petroleum Company ever since 1982, when it was spun off from Cities Services Company.