A cubit, the name of a hill which Joab and Abishai reached as
the sun went down, when they were in pursuit of Abner (2 Sam. 2:24). It lay to the east of Gibeon.
Smith's Dictionary
(head), The hill of, A hill facing Giah by the way of the wilderness of Gibeon, named as the point to which Joab pursued Abner (2 Samuel 2:24)