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 for bootstrap loader
From The Free On-line Dictionary of Computing (30 December 2018) :

  bootstrap loader
      A short program loaded from non-volatile
     storage and used to bootstrap a computer.
     On early computers great efforts were expended on making the
     bootstrap loader short, in order to make it easy to toggle
     in via the front panel switches.  It was just clever enough
     to read in a slightly more complex program (usually from
     punched cards or paper tape), to which it handed control.
     This program in turn read the application or operating
     system from a magnetic tape drive or disk drive.  Thus,
     in successive steps, the computer "pulled itself up by its
     bootstraps" to a useful operating state.
     Nowadays the bootstrap loader is usually found in ROM or
     EPROM, and reads the first stage in from a fixed location on
     disk,+called+the+"{boot+block">the disk, called the "{boot block".  When this program
     gains control, it is powerful enough to load the actual OS
     and hand control over to it.  A diskless workstation can use
     bootp to load its OS from the network.

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