Final answer:
Cutting the hair at 0 degree projection creates a solid form or blend effect.
Step-by-step explanation:
In the context of hair cutting, the term "0 degree projection" refers to cutting the hair perpendicular to the head, along a horizontal plane. When the hair is cut at this angle, it creates a solid form or a blend effect. This means that the hair is cut to maintain a consistent length throughout, resulting in a seamless and smooth appearance.