The name of the principal god among the Syrians, who, as representing the sun, had, according to Macrobius, a Roman author of about the early part of the fifth century, in the Saturnaliorum (I, 23), an image surrounded by rays.

Macrobius, however, is wrong, as Selden has shown, De Diis Syris, volume I, page 6, in confounding Adad with the Hebrew Achad, or one—a name, from its signification of unity, applied to the Great Architect of the Universe.

The error of Macrobius, however, has been perpetuated by the inventors of the high degrees of Freemasonry, who have incorporated Adad, as a name of God, among their significant words.