What the hell are Painters points? Do I need them? How do you make them? Quick and cheap how to

What the hell are Painters points? I quite often make these 1 point to 1 piece of wood, Very useful for paint spraying Don't leave them sitting on the floor! 👍 🙄 😁 ... https://www.youtube.com/watch?v=UOtaImKbTmk