Glossary
Grip zones
A loose way of saying which part of the hand actually touches the implement.
There is no official map called grip zones. What matters is the skin that meets the surface. On a deadlift that is the palm and the fingers around the knurl. On a crimp it is the pads of the fingers. On rings and bars it is the palm plus the leather of a dowel grip, if you wear one.
Put chalk there. A coat across the back of the hand does nothing for friction and makes a mess of your shirt.