DNP components (which stands for do not populate or do not place) refers to the components designed into a circuit that aren't placed right away — if at all — on the actual board. Incorporating these components into a design allows for a modular PCB design with easier rework.

What does DNP mean in schematics?

"Do not populate" or "do not place", a term used in printed circuit board design to denote the omitting of a component.

What is unpopulated PCB?

An unpopulated PCB; i.e., a PCB with no components assembled on it yet. (Not to be confused with "Bare Bones", which is sometimes used to designate a PCB with no Soldermask or Legend). Base Copper Weight. see Copper Foil.