'Watchtower' in the Bible

And when Judah came toward the watch tower in the wilderness, they looked unto the multitude, and, behold, they were dead bodies fallen to the earth, and none escaped.

Prepare the table, watch in the watchtower, eat, drink: arise, ye princes, and anoint the shield.

And he cried, A lion: My lord, I stand continually upon the watchtower in the daytime, and I am set in my ward whole nights: