radiation warning sign; trefoil; radiation warning symbol
Refers to the internationally recognized symbol indicating the presence of ionizing radiation, often a magenta or black trefoil on a yellow background.
A radiation warning sign is posted on the laboratory door.
If you see a radiation warning symbol, please do not approach that area.
放射線 refers to the radiation itself, while 放射能標識 is the warning sign or symbol indicating its presence.
危険標識 is a general danger sign, whereas 放射能標識 specifically warns of radiation hazards.
Compound of 放射能 (radioactivity) and 標識 (sign, marker). The term is a straightforward technical compound with no known historical irregularities.