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 for printed circuit board
From The Free On-line Dictionary of Computing (30 December 2018) :

  printed circuit board
      (PCB) A thin board to which electronic components
     are fixed by solder.  Component leads and integrated circuit
     pins may pass through holes ("vias") in the board or they may
     be surface mounted, in which case no holes are required
     (though they may still be used to connect different layers).
     The simplest kind of PCB has components and wires on one side
     and interconnections (the printed circuit) on the other.  PCBs
     may have components mounted on both sides and may have many
     internal layers, allowing more connections to fit in the same
     board area.  Boards with internal conductor layers usually
     have "plated-through holes" to improve the electrical
     connection to the internal layers.
     The connections are metal strips (usually copper).  The
     pattern of connections is often produced using photo-resist
     and acid etching.  Boards, especially those for high frequency
     circuits such as modern microprocessors, usually have one or
     more "{ground planes" and "power planes" which are large
     areas of copper for greater current carrying ability.
     A computer or other electronic system might be built from
     several PCBs, e.g. processor, memory, graphics controller, disk
     controller etc.  These boards might all plug into a
     motherboard or backplane or be connected by a ribbon

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