• Borrowed from French gnomon, or directly from its etymon Latin gnōmōn, or directly from its etymon Ancient Greek γνώμων ("discerner, interpreter; carpenter’s square; gnomon of a sundial; (geometry) gnomon"), from γιγνώσκω, ultimately from Proto-Indo-European *ǵneh₃- ("to know"); the word is thus related to know.
  • The geometry sense (sense 4) is from the resemblance of the plane figure to a carpenter’s square. Similarly, a gnomon in mathematics (sense 5) is also shaped like a carpenter’s square when depicted pictorially if the figurate numbers are squares.

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