V-scoring (also known as v-cutting or v-grooving) is a process of cutting a 'V' shaped groove at the top and bottom of a printed circuit board (PCB) leaving a remaining bridge to hold the boards together. V-scoring also makes it easier to remove discrete parts from a circuit board.
The depth of cut is usually 1/3 on top, 1/3 on bottom side, the scoring angel is usually 30°.
PCB V-scoring is a form of PCB panelization that allows you to fit multiple PCBs onto a single manufactured board and separate them after assembly. The boards are typically set up side by side and end to end with the edges adjacent to each other. After assembly process, the panel will be separated.