Ledge

n.
  1. A shelf on which articles may be laid; also, that which resembles such a shelf in form or use, as a projecting ridge or part, or a molding or edge in joinery.
  2. A shelf, ridge, or reef, of rocks.
  3. A layer or stratum.
  4. (Mining) A lode; a limited mass of rock bearing valuable mineral.
  5. (Shipbuilding) A piece of timber to support the deck, placed athwartship between beams.