The hat’s upper edge of the Apollo-Mithra-Helios-Hermes head, on the west terrace.
The decorative motif is to be understood as representing the beams of the sun, referring to both Helios (Greek personification of the Sun) and Mithra (depicted with a bundle of sun rays surrounding his head, on Sassanid reliefs of the 3th century BC).

Correspondent: J.M.Criel, Antwerpen.
Source: (amongst others) Wikipedia .