#projection  any structure that branches out from a central support
  supertype:  #physical_structure__structure__construction  a thing constructed; a complex construction or entity; "the structure consisted of a series of arches"; "she wore her hair in an amazing construction of whirls and ribbons"
  subtype:  #arm.projection  any projection that is thought to resemble an arm; "the arm of the record player"; "an arm of the sea"; "a branch of the sewer"
  subtype:  #brim  a circular projection that sticks outward from the crown of a hat
     subtype:  #eyeshade__bill__peak__visor__vizor  a brim that projects to the front to shade the eyes; "he pulled down the bill of his cap and trudged ahead"
  subtype:  #burr  rough projection left on a workpiece after drilling or cutting
  subtype:  #cleat  a metal or leather projection (as from the sole of a shoe); prevents slipping
     subtype:  #calk__calkin  a metal cleat on the bottom front of a horseshoe to prevent slipping
  subtype:  #cornice  the topmost projecting part of an entablature
  subtype:  #drip_mould__drip__drip_mold  (architecture) a projection from a cornice or sill designed to protect the area below from rainwater
     subtype:  #hoodmold__dripstone__hoodmould  a drip made of stone
  subtype:  #flange__rim  a projection used for strength or for attaching to another object
  subtype:  #fluke.projection__flue  flat blade-like projection on the arm of an anchor
  subtype:  #head.projection  a projection out from one end; "the head of the nail", "a pinhead is the head of a pin"
     subtype:  #pinhead  the head of a pin
  subtype:  #knob  a rounded projection or protuberance
     subtype:  #knobble  a small knob
  subtype:  #lobe.projection  a rounded projection that is part of a larger structure
  subtype:  #lug  a projecting piece that is used to lift or support or turn something
  subtype:  #overhang  projection that extends beyond or hangs over something else
     subtype:  #eaves__eave  the overhang at the lower edge of a roof
     subtype:  #fantail  an overhang consisting of the fan-shaped part of the deck extending aft of the sternpost of a ship
  subtype:  #prong  a pointed projection
     subtype:  #tine  prong on a fork or pitchfork
  subtype:  #spike.projection  a sharp-pointed projection along the top of a fence or wall
  subtype:  #tenon  a projection at the end of a piece of wood that is shaped to fit into a mortise and form a mortise joint
  subtype:  #tooth_like_thing__tooth  something resembling the tooth of an animal
     subtype:  #cog__sprocket  tooth on the rim of gear wheel
  subtype:  #tooth_projection_on_a_gear__tooth  one of a number of uniform projections on a gear

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