signal flag
n. 信号旗；手旗
同义词
参考例子
1.This actually is a "price peaked can sell" signal flag.
这实际上已经是“楼价见顶，可以抛售”的信号旗了。
2.The signal flag or light shall be removed as soon as the pilot leaves the pilot boat or is out of service.
引水人离去引水船或非执行业务时，应将引水船信号或灯号撤除。
3.Communication was only possible by signal flag and by sending boats. In the swirling smoke of battle both of these became impractical methods of communication.
海战中各船的沟通只依靠信号旗和派小舟联络，所以烟雾弥漫的战场中这都不太管用。
英文解释
n.
1.a rectangular piece of fabric used as a signalling device
网络释义
signal flag
信号旗; 号志旗; 标旗; 讯号旗;
danger signal red flag red light
危险信号;
hand signal flag
手摇旗;
signal flag WESTBANK
号志旗;
international signal flag
国际信号旗;