Before revision: A via consists of: Barrel — conductive tube filling the drilled hole Pad — connects each end of the barrel to the component, plane, or trace Antipad — clearance hole between barrel and metal layer to which it is not connected A via, sometimes called PTV or plated-through-via, should not be confused with a plated through hole (PTH).
After revision: Raspberry Pi Pico with castellated holesA via consists of: Barrel — conductive tube filling the drilled hole Pad — connects each end of the barrel to the component, plane, or trace Antipad — clearance hole between barrel and metal layer to which it is not connected A via, sometimes called PTV or plated-through-via, should not be confused with a plated through hole (PTH).