SCSI initiator

from The Free On-line Dictionary of Computing (8 July 2008)

SCSI initiator
initiator

   <hardware> A device that begins a {SCSI} transaction by
   issuing a command to another device (the {SCSI target}),
   giving it a task to perform.  Typically a SCSI host adapter is
   the initiator but targets may also become initiators.

   (1999-02-10)