Morse code

And the International "Q" signals, recognizable in any language:


 * http://www.learnmorsecode.com/


 * http://www.learnmorsecode.com/qsig.html


 * http://www.babbage.demon.co.uk/morseabc.html


 * http://morsecode.scphillips.com/jtranslator.html

Morse Code