RPL

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

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RPL (derived from Reverse Polish Lisp according to its original developers, whilst for a short while in 1987 HP marketing attempted to coin the backronym ROM-based Procedural Language for it) is a handheld calculator operating system and application programming language used on Hewlett-Packard's scientific graphing RPN (Reverse Polish Notation) calculators of the HP 28, 48, 49 and 50 series, but it is also usable on non-RPN calculators, such as the 38, 39 and 40 series. RPL is a structured programming language based on RPN, but equally capable of processing algebraic expressions and formulae, implemented as a threaded interpreter. RPL has many similarities to Forth, both languages being stack-based, as well as the list-based LISP. Read more on Wikipedia...

RPL Wikipedia page
RPL first developed in Hewlett-Packard
There are 11 Project Euler users using RPL
Explore RPL snippets on Rosetta Code
See also: (3 related languages)Forth, Lisp, Assembly language
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Example 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 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...
»

title	authors	year	publisher
Rpl (programming Language)	Surhone and Lambert M. and Timpledon and Miriam T. and Marseken and Susan F.	2010
An Introduction To Hp48 System Rpl And Assembly Language Programming	James Donnelly	1995	Armstrong Pub Co

RPL - Programming language

Language features

Books about RPL on goodreads

Books about RPL from ISBNdb