[APL][1]
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This language is incredibly powerful and very terse, it *will* hurt your brain.

For starters it's tricky to use without a custom keyboard, or at least a keyboard overlay to show up all the obscure symbols it uses.

![APL Keyboard][2]

Then the language is of the vector/array-based paradigm and specialises towards complex linear algebra. The original version did not even have loop constructs, anything and everything done by chaining rather unusual array operators together.

 * `strip_tags()` anybody? (borrowed from Wikipedia)

![strip_tags() ala APL][3]



 [1]: http://en.wikipedia.org/wiki/APL_(programming_language)
 [2]: https://i.sstatic.net/HSVJV.png
 [3]: https://i.sstatic.net/AnaFz.gif