Elements of a haircut.
The essential elements are edging, siding and topping:
Edging refers to the design of the lower edge of hair growth from the sideburns around the ears and across the nape of the neck.
Siding refers to the design of the hair on the back and sides between the edge and the top.
Edging and siding, together or separately, commonly referred to as tapering, create a taper-
Topping refers to the design of the hair at the front and over the crown-
Edging comes first, followed by siding and topping.
Edging is typically done with clippers; siding, shears over comb; topping, shears over finger.
There are other methods that can be utilized including all clipper cuts, all shears cuts and all razor cuts.
Barbers distinguish between a two line and a one line haircut.
Two line haircuts are standard taper cuts. The hair is outlined around the ears and then straight down the sides of the neck.
The edge of hair growth at the nape of the neck is tapered to the skin with a fine(zero) clipper blade.
A one line haircut, often referred to as a block cut, has the edge of hair growth at the nape outline shaved, creating an immediate transition between hair and skin and connecting the outline from the right sideburn to the outline from the left sideburn across the nape.
The outline at the edge of the nape can be in a squared off or rounded pattern. A squared off nape can have squared or rounded corners.
Rotary, taper and edger clippers can be utilized when edging or siding a haircut. Guards and/or blades can be attached that vary the cutting length.