放ほう射しゃ能のうマーク

noun

radiation warning symbol; trefoil

Refers to the internationally recognized symbol for ionizing radiation, often a black trefoil on a yellow background.

• 病びょう院いんの放ほう射しゃ線せん室しつのドアには放ほう射しゃ能のうマークが貼はってある。

  A radiation warning symbol is affixed to the door of the hospital's radiology room.