Easel n. : A frame (commonly) of wood serving to hold a canvas upright, or nearly upright, for the painter's convenience or for exhibition.

Example:
How do I hang a picture with an Easel on the back?

Taxonomy
easel, design, artist's easel, Studio easels, Display easels, free encyclopedia, legs, donkey, languages, panel, vertical posts, Variations, crossbars, independent mechanism, stability, Dutch, common designs, search.

Defination from the web:
easel is an upright support used for displaying and/or fixing something resting upon it. ... The simplest form of an artist's easel, a tripod, consists of three vertical posts joined at one end. ...