'Hollow' in the Bible

He cast two hollow bronze pillars: each 27 feet high and 18 feet in circumference.

Then Ben-Hadad sent to him and said, "Thus may the gods do to me and thus may they add if the dust of Samaria is sufficient for the hollow of a hand for all of the people who are at my feet."

And the battle increased that day; and the king was stayed up in his chariot against the Syrians, and he died at even; and the blood of the wound ran out into the hollow of the chariot.