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(nautical) Any of a set of simple geometricshapes that are hung from a mast and visually indicate the status of a vessel to other vessels.
1903, Proceedings of the United States Naval Institute, volume 29, page 425:
It would be a very simple matter to include with each keyboard, whether for night signal sets or day semaphores, a small vertical panel with miniature reproductions of the night lanterns in their proper color and position, and of the day shapes in proper order; these last to be made by illuminating a circular aperture containing a darkened glass disc with the figure of the shape in white.
2006, Elbert S. Maloney, Chapman Piloting & Seamanship, page 145:
International Rule 25(e) requires the use of a cone, with point downward, as a day shape on all sailing vessels using machinery for propulsion while its sails are up.
Day shapes on Wikipedia.Wikipedia 