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三方錐 (sanhousui) Japanese meaning: trigonal pyramid | Kotomora

三さん方ほう錐すい

Meanings

1

trigonal pyramid

Technical term in geometry and crystallography for a pyramid with a triangular base.

三さん方ほう錐すいは、底てい面めんが三さん角かく形けいのピラミッド形けいである。
A trigonal pyramid is a pyramid shape with a triangular base.

Kanji

三three
方direction, person, alternative
錐auger, drill, awl

Related words

三さん角かく錐すい
三角錐 is a more common term for a triangular pyramid, while 三方錐 is used in specific technical contexts such as crystallography.

Etymology

Compound of 三 (three), 方 (direction), and 錐 (pyramid/cone). The exact historical derivation is uncertain; the term is used in technical fields.