DuckCorp Dico

Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   SIR
      1. <language> An early system on the IBM 650.
      [Listed in CACM 2(5):16, May 1959].
      2. <standard> 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.
      [Reference?]
      (1999-10-14)