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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
power-on reset
POR
(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)