A Unit is a volume of 1x1x1 studs, and is the standard measurement used for selling wood and how much wood is required for a certain Blueprints.

To create a unit, one must have a sawmill with the Plank Cross Section set to X: 1, and Y: 1. Then, they must slice the plank to the correct length of 1 stud, which can be achieved by cutting it to match the length of a Tiny Tile blueprint.