A gnomon is the part of a sundial that casts the shadow.
Gnomon may also refer to:
Gnomon (figure), in geometry, a plane figure formed by removing a similar parallelogram from a corner of a larger parallelogram Gnomon (journal), a German language academic journal of classics Gnomon (novel), a science fiction novel by Nick Harkaway Gnomon, the difference between a pair of consecutive figurate numbers Gnomon, one of the twenty-five fictional islands in the fantasy book series The Books of Abarat Gnomon School of Visual Effects, a Hollywood-based university Gnomon, a proposed 1,000 megaton nuclear weapon conceived alongside Sundial. The proper name of the star WASP-43
See also Gnomonic projection