obelisk

noun
🔊/ˈɒbəlɪsk/
🔊/ˈɑːbəlɪsk/, 🔊/ˈəʊbəlɪsk/
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  1. a tall pointed stone column with four sides, put up in memory of a person or an event方尖碑
    Topics Buildingsc2
    Word Originmid 16th cent.: via Latin from Greek obeliskos, diminutive of obelos ‘pointed pillar’.