黃旗

Noun

 * 1)  a yellow banner (used by the military in ancient times)
 * 2)  a yellow banner used by the police: "Police Cordon, Do Not Cross / "
 * 3)  a yellow banner used by the police: "Police Warning: You are in breach of the law. You may be prosecuted. / "

Proper noun

 * 1)  Denmark