A norm; a principle or rule; a model; a standard.
A mason's or a carpenter's square or rule.
a small constellation in the southern hemisphere near Lupus and Ara in the Milky Way
Latin = pattern or rule, or aspect; adjective, normal - according to rule.
Norma (IPA: , ), is a small and inconspicuous constellation that lies in the southern hemisphere between Scorpius and Centaurus. The Milky Way passes through it. In English the constellation is variously known as The Rule, The Carpenter's Square, The Set Square and The Level.