An object used as a sign to convey warning, direction, or information.
| 单词 | θ191867 | 
| 释义 | society > communication > indication > signalling > 			[noun]		 > thing or apparatus used for (4)		 signal1687 An object used as a sign to convey warning, direction, or information. disc1856 Railways. A coloured disc used as a signal or forming the principal part of one; (also) a disc signal. signaller1872 A device used to make signals. shape1879 concrete in technical uses. Nautical. A cone, ball, or drum of metal or canvas used in signalling. | 
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