WRITTEN BY: The Editors of Encyclopaedia Britannica
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Sol, in Roman religion, name of two distinct sun gods at Rome. The original Sol, or Sol Indiges, had a shrine on the Quirinal, an annual sacrifice on August 9, and another shrine, together with Luna, the moon goddess, in the Circus Maximus. Although the cult appears to have been native, the Roman poets equated him with the Greek sun god Helios.
The worship of Sol assumed an entirely different character with the later importation of various sun cults from Syria. The Roman emperor Elagabalus (reigned AD 218–222) built a temple to him as Sol Invictus on the Palatine and attempted to make his worship the principal religion at Rome. The emperor Aurelian (reigned 270–275) later reestablished the worship and erected a magnificent temple to Sol in the Campus Agrippae. The worship of Sol as special protector of the emperors and of the empire remained the chief imperial cult until it was replaced by Christianity."
The internet also suggests SOL stands for Shit Out of Luck.