Plank may refer to many different things:
A plank is a flat piece of timber, sawn and planed; it is technically distinguished from a board by its greater thickness, and should measure from 2 to 4 inches (~5 to 10 cm) in thickness and from 10 to 11 inches (~25 to 28 cm) in width.
Plank is also a term for an individual article in a political platform.
Plank is a fictional character on the animated series Ed, Edd n Eddy. Plank is a short plank of wood with a drawn-on mouth and eyes. Johnny is Plank's best friend and carries him around. Plank speaks, although Johnny is the only one able to hear him. (The viewer can not hear what Plank says.) Plank also moves, but only when no one is looking.
The Plank is a noted British silent comedy film, made in 1967. Written by Eric Sykes, it stars Sykes, Roy Castle, Tommy Cooper, Jim Dale, Jimmy Edwards, Hattie Jacques, Stratford Johns, and John Junkin. There was also a later television remake. details required