This 'horn' constitutes his crown, and he is frequently represented on seal cylinders with a crescent over his head, and with a long flowing beard, that is described as having the color of lapislazuli.

A frequent title is the 'lord of the crown.' On the other hand, by virtue of its influence on the earth, regulating, as the ancients observed, the tides, the moon was connected by the Babylonians with the reckoning of time.
Because of this connection with the 'lower world,' it seems, he was also regarded as the first-born of Bel.

His sacred edifice at Ur was one to which all rulers of the place devoted themselves.

Ur-Gur, Nur-Ramman, Sin-iddina, and Kudur-mabuk tell of their embellishment of the temple, each one appropriating to himself the title of 'builder,' in which they gloried.

So close, again, was the identification of the city with the deity, that the latter was frequently known simply as the god of Ur, and the former, as the city of Nannar.
Another name of the moon-god was Sin,--the meaning of which escapes us.
At the side of Ur, Harran is the place most celebrated by reason of its moon-worship, and there is every reason to believe that the name Sin was originally attached to Harran.