'Signal' in the Bible

“Flee for safety, O sons of Benjamin,From the midst of Jerusalem!Now blow a trumpet in TekoaAnd raise a signal over Beth-haccerem;For evil looks down from the north,And a great destruction.

Lift up a signal against the walls of Babylon;Post a strong guard,Station sentries,Place men in ambush!For the Lord has both purposed and performedWhat He spoke concerning the inhabitants of Babylon.

Lift up a signal in the land,Blow a trumpet among the nations!Consecrate the nations against her,Summon against her the kingdoms of Ararat, Minni and Ashkenaz;Appoint a marshal against her,Bring up the horses like bristly locusts.