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 for static random-access memory
From The Free On-line Dictionary of Computing (30 December 2018) :

  static random-access memory
  static RAM
      (SRAM) Random-access memory in which each bit of
     storage is a bistable flip-flop, commonly consisting of
     cross-coupled inverters.  It is called "static" because it
     will retain a value as long as power is supplied, unlike
     dynamic random-access memory (DRAM) which must be regularly
     refreshed.  It is however, still volatile, i.e. it will lose
     its contents when the power is switched off, in contrast to
     SRAM is usually faster than DRAM but since each bit requires
     several transistors (about six) you can get less bits of SRAM
     in the same area.  It usually costs more per bit than DRAM and
     so is used for the most speed-critical parts of a computer
     (e.g. cache memory) or other circuit.

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