Forth is a computer programming language based on Reverse Polish Notation, e.g. in arithmetics like HP calculators:
 1 2 + 3 * 4 /
 ~ [expr ((1+2)*3)/4)]

http://www.forth.org

FORTH in tcl anyone?
   * [A different FORTH]    -- [JBR]
   * [Trying FORTH in Tcl]  -- [jcw]
   * [RPN in Tcl], [RPN again] -- [RS]
   
Chuck Moore created FORTH.  An interesting article about FORTH appeared in Byte magazine [http://www.colorforth.com/byte.htm] .

Related to this is [1% the code] a shocking paper by Chuck Moore.

Tutorials

   * Brief Introduction [http://www.ece.cmu.edu/~koopman/forth/hopl.html]
   * And so Forth (a primer)[http://www.xs4all.nl/~thebeez/ForthPrimer/Forth_primer.html]
   * Comprehensive (for 4tH)[http://www.geocities.com/SiliconValley/Bay/2334/4thtutor.htm]

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Often over the years, FORTH and Tcl have been compared because of the
mindset in both to write lots of procs/words to do one's work. 

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[Category Language]