σίγνον

Etymology
Borrowed from.

Noun

 * 1) signum, statue
 * 2)  place where the standards were set up in a camp or kept in administrative headquarters
 * 3)  arrest, prison

Usage notes
Since the army reforms the word in the meaning of a field standard slowly fell into disuse, as the legions were split up into partial detachments, these bearing the  and the  being kept at home, and also the  introduced. From the 6th century only /  was used. See for another term in later Byzantine Greek. In literature any of these terms was covered up by.