A shelf pl.: shelves1 is a flat, horizontal plane used for items that are displayed or stored in a home, business, store, or elsewhere. it is raised off the floor and often anchored to a wall, supported on its shorter length sides by brackets, or otherwise anchored to cabinetry by brackets, dowels, screws, or nails. it can also be held up by columns or pillars. a shelf is also known as a counter, ledge, mantel, or rack.1 tables designed to be placed against a wall, possibly mounted, are known as conso