J is a language derived from APL, created by the creator of APL (http://www.jsoftware.com/)
A program which will print ad-libitum the sentence Hello World! on the screen might look like this:
(3 : ' while. 1 do. 0#y. 1!:2 (2) end.') 'Hello World!'
Since J is completely based on ASCII characters there's no need to provide a reading of the program. Just cut & paste the line in the session and J will do its work.
submitted by: stf@apl.it (Stefano Lanzavecchia)