A stone or monument, usually with an engraved inscription, marking a tomb or grave.
Webster's New World
(mathematics) The symbol "∎" marking the end of a proof.
(surfing) For a surfboard to stand upright half-submerged in the water (like a tombstone, above) because the surfer is underwater with his or her legrope pulled tight. Often this indicates a surfer in difficulty, either held down by the power of a wave or unconscious and unable to get to the surface.
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