pyramidion

noun
pyr·a·mid·i·on | \ˌpirəˈmidēˌän, -ēən\
plural pyramidions\-nz \ also pyramidia\-dēə \

Definition of pyramidion 

: a small pyramid (as at the top of an obelisk or at the apex of a large pyramid)

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History and Etymology for pyramidion

New Latin, diminutive of Latin pyramid-, pyramis pyramid

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