Skirting board

[Renato]

a piece of wood that is joined to the bottom of a wall where it meets the floor

[Mary Mallozziberg]

Skirting boards, also known as baseboards, are boards that run around the lowest part of an interior wall. Typically, they cover the joint between the floor and the wall surface. However, they are more commonly to be a simple plank of timber that has been fixed (with nails, screws, glue, and so on), to the wall