'Signal' in the Bible

Lift up a signal toward Zion, bring yourselves to safety; you must not remain standing, for I [am] bringing evil from [the] north, and a great destruction.

Flee for safety, children of Benjamin, from the midst of Jerusalem. And in Tekoa blow a horn, and on Beth-haccherem lift up a signal, for evil looks down from [the] north, and a great destruction.