A matched hook and an eye (loop into which the hook can fit), used for fastening.
A peg or hook for hanging something on
A pointed rock or crag
A small cask or barrel; a keg or noggin
A knot in a piece of wood or the base of a branch
A short spur or stiff projection from the trunk or branch of a tree, such as the stunted dead branch of a fir
To hang something on a peg