六ろっ角かく柱ちゅう

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Meanings

1

noun

hexagonal prism

A solid geometric figure with two parallel hexagonal bases and rectangular lateral faces.

angle, corner, square

柱pillar, post, cylinder

六ろっ角かく形けい
六角形 is a two-dimensional hexagon, while 六角柱 is a three-dimensional hexagonal prism.
六ろっ角かく錐すい
六角錐 is a hexagonal pyramid, which tapers to a point, unlike the prism shape of 六角柱.

Compound of 六角 (hexagonal) + 柱 (pillar, column).