Nape

Nape (?), n. [Perh. akin to knap a knop.]

The back part of the neck.

Spenser.

© Webster 1913.

The place on your neck where your lover's breath can make you turn to jelly. Where a pair of lips with gentle sucking can make you loose control. A connection to your erotic center, hidden in plain view.

The nape of a doorkey is the small stub between the head and the teeth. It typically drops from the head to the teeth at a right angle, but may be a bit bulbous.

The nape is the starting point for the bitting of the teeth when a locksmith is cutting a new key from a keyblank.