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

     1.  An early system on the IBM 650.
     [Listed in CACM 2(5):16, May 1959].
     2.  Serial Infrared.  An infrared standard from
     IrDA, part of IrDA Data.  SIR supports asynchronous
     communications at 9600 bps - 115.2 Kbps, at a distance of up
     to 1 metre.

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