From Wikipedia, the free encyclopedia. A solar symbol is a symbol which symbolises the Sun. Solar symbols can have significance in psychoanalysis, symbolism, semiotics, astrology, religion, mythology, mysticism, divination, heraldry, and vexillology, among other fields.his is an ancient solar symbol featuring a circle with its center marked with a dot (Unicode U+2609 ☉ preferably or U+2299 ⊙). It is the astronomical and astrological symbol for the Sun, and the ancient Egyptian sign for sun or  Ra  in the hieroglyphic writing system (U+131F3, 𓇳).