Correct

旗语

/ qíyǔ / 
Strokes

Definition

flag signals (for communicating between ships or army units)/semaphore

Example

As a Noun

flag signal; semaphore

1
Yòng
用
qíyǔ
旗语
tōngxùn
通讯

flag a message

2
Dá
打
qíyǔ
旗语

signal by semaphore; semaphore