"Leet speak" (or 1337 speak)

It's an Internet meme in the Hacker/cracker among "the elite" - "leet" which often has things like the letter e replaced with 3, and o with 0, T with 7 etc

Frankly, it's an internet form somewhat like cockney rhyming slang

see
http://en.wikipedia.org/wiki/Leet
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73 de KG2V
You are what you do when it counts - The Masso
Homepage: http://www.thegallos.com
Blog: http://kg2v.blogspot.com