Structural engineering

• A primitive latch
  Latch (hardware)
  A latch is a type of mechanical fastener that is used to join two objects or surfaces together while allowing for the regular or eventual separation of the objects or surfaces....
  
   consisting of a post barring a door
• The top tube of a bicycle frame
• The horizontal member of many sports goals
  Goal (sport)
  Goal refers to a method of scoring in many sports. It can also refer to the physical structure or area of the playing surface where scoring occurs....
  
   including those for hockey, association football, rugby league, rugby union and American football
• A horizontal member of an electricity pylon
  Electricity pylon
  A transmission tower is a tall structure, usually a steel lattice tower, used to support an overhead power line. They are used in high-voltage AC and DC systems, and come in a wide variety of shapes and sizes...
  
  , that carries the conductors

Networking and electronic engineering

• A crossbar switch
  Crossbar switch
  In electronics, a crossbar switch is a switch connecting multiple inputs to multiple outputs in a matrix manner....
  
  , a switch connecting multiple inputs to multiple outputs in a matrix manner
• A circuit composed of crossbar latch
  Crossbar latch
  The cross-bar latch is a technology invented by Hewlett-Packard in October 2001, that potentially could replace transistors in some applications. Transistors are essential components of logic gates and memory cells in digital electronic systems...
  
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