haircutting scissors 
Straight-bladed scissors used to trim hair.
notched single-edged thinning scissors
Scissors that can both trim and thin hair because they have a straight lower blade and a notched upper blade.
Blade with a smooth cutting edge that cuts straight across the hair.
Blade with an edge that has a row of teeth; it is used to cut hair in points.
notched double-edged thinning scissors
Scissors with notched blades that thin the hair by cutting individual locks in points.
Each of the sharp projections on the blade.