Illustrated Companion to the Latin Dictionary/Norma

This article incorporates text from a publication now in the public domain: Rich, Anthony (1849). The illustrated companion to the Latin dictionary, and Greek lexicon. p. vi. OCLC 894670115. https://archive.org/details/illustratedcompa00rich. 

NORMA (κανών). A square for measuring right angles; employed by carpenters, masons, builders, &c. to prove that the angles are true. (Vitruv. vii. 3. Plin. xxxvi. 51.) It was formed in two ways; either by two rules (regulae) joined together at right angles, or by a flat piece of board with a right angle cut out of it; both of which are exhibited in the illustration (Norma/1.1), from sepulchral marbles.

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  Norma/1.1