Reverse Polish Lisp, aka Reverse Polish Lisp, is a historical programming language created in 1984.

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Example code from the Hello World Collection:

Hello World in RPL for the HP-28, HP-48, HP-49 and HP-50 series pocket calculators. No comments possible.

<<
    "HELLO WORLD"
    1 DISP
    60 FREEZE
>>

Example code from Wikipedia:

« 
   0       @ Start with zero on the stack
   1 10    @ Loop from 1 to 10
   FOR I   @ "I" is the local variable
      I +  @ Add "I" to the running total
   NEXT    @ Repeat...
»
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Last updated February 11th, 2019