1. 
   RP-1
   (rocket propellant 1) A special grade of kerosene suitable for rocket engines (see petroleum-based propellant). Together with liquid oxygen it provides, or has provided, the propellant for the first stages of rockets such as the Atlas, Thor, Delta, Titan I, and Saturn 1B and V. ...
   Found op http://www.daviddarling.info/encyclopedia/R/RP-1.html
   
   
2. 
   RPL-1
   Data reduction language. Proc SJCC 30:571-575, AFIPS (Spring 1967).
   Found op http://foldoc.org/RPL-1
   
   

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