1. (n.) An upright, four-sided pillar, gradually tapering as it rises, and terminating in a pyramid called pyramidion\. It is ordinarily monolithic. Egyptian obelisks are commonly covered with hieroglyphic writing from top to bottom.

2. (n.) A mark of reference; -- called also dagger [/]. See Dagger.

3. (v. t.) To mark or designate with an obelisk.

antenna tower arch barbican barrow belfry bell tower boundary stone brass bust cairn campanile cenotaph colossus column cromlech cross cup cupola cyclolith derrick dolmen dome fire tower footstone grave gravestone headstone hoarstone inscription lantern lighthouse marker martello martello tower mast mausoleum megalith memento memorial memorial arch memorial column memorial statue memorial stone menhir minaret monolith monument mound necrology obituary observation tower pagoda pilaster pillar pinnacle plaque pole prize pylon pyramid reliquary remembrance ribbon rostral column shaft shrine skyscraper spire standpipe steeple stela stone stupa tablet television mast testimonial tomb tombstone tope tour tower trophy turret water tower windmill tower