'Lock' in the Bible

I rose to open to my beloved, And my hands dropped myrrh, Yea, my fingers flowing myrrh, On the handles of the lock.

And He putteth forth a form of a hand, and taketh me by a lock of my head, and lift me up doth a spirit between the earth and the heavens, and it bringeth me in to Jerusalem in visions of God, unto the opening of the inner gate that is facing the north, where is the seat of the figure of jealousy that is making jealous,

And their head they do not shave, and the lock they do not send forth; they certainly poll their heads.