379009: That's 'Google' in Calculator Language
Next time you don't have a MacBook or your binary LED watch around to show your 'eleet' factor, pick up a calculator and make some calculator words using some calculator spelling or beghilos as it is called. What's that? It's a technique of spelling words by reading characters upside-down from calculators. Here's more information from Wikipedia.
Here are a few to get you started.
BEE = 338
GOOGLE = 379009
LOOSE = 35007
There's more at the Wikipedia link above.