An apparatus for signaling by means of mechanical arms, lanterns, flags, etc.

臂式信号装置；手旗。

In the army, a system of signaling in which letters are represented by various positions of the arms in relation to the body.

(军队用之)手旗通信法。

To convey (information) by or as if by semaphore.

以信号传递(消息)。

To send signals by or as if by semaphore.

打信号。