DuckCorp Dico

Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   power-on reset
   POR
      <hardware>(POR) The processes that take place when a
      hardware device is turned on.  This may include running
      power-on self-test or reloading software from
      non-volatile storage.  The term implies that the device
      has some reasonably complex internal state that will be
      set back to a "normal" initial condition.  This state may
      include the physical state of the device (e.g. a printer)
      as well as data in the memory of an embedded system.
      If a device has no reset button, and sometimes even
      if it does, turning it off and on again (power
    cycling) may be the only way to clear a fault.
      (2012-02-09)