norm Look up norm at Dictionary.com
"standard, pattern, model," 1821, from Fr. norme, from O.Fr., from L. norma "carpenter's square, rule, pattern," of unknown origin. Klein suggests a borrowing (via Etruscan) of Gk. gnomon "carpenter's square." The L. form of the word, norma, was used in Eng. in the sense of "carpenter's square" from 1676.