pyramidion

[pir-uh-mid-ee-uhn, -on]
noun, plural pyramidia [pir-uh-mid-ee-uh] .
a miniature pyramid, as at the apex of an obelisk.

Origin:
1830–40; < Neo-Latin, equivalent to pȳramid- pyramid + -ion diminutive suffix < Greek

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Thus, there are lightning rods in the pyramidion, even in its pencil-sharp point.
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