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A pyramidion (pl. pyramidia) is the uppermost piece or capstone of an Egyptian pyramid or obelisk.

The Washington Monument's pyramidion was cast by William Frishmuth from aluminum, at the time a rare metal as valuable as silver.

A set of eight lightning rods installed in 1934 around the aluminum pyramidion, which protrude above its tip by another 15.2 cm (6.0 in).

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15y ago

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