rectangular figures
Refers to shapes or diagrams that are rectangular in form. The term is somewhat technical and may appear in mathematical or descriptive contexts.
Several rectangular figures are drawn in this diagram.
The term is composed of 直 (straight), 銭 (coin, money), and 形 (shape). The exact derivation is uncertain; it may refer to the rectangular shape of old coins or simply describe a straight-edged coin-like form.