I thought you all might like this. It's called Semaphore. You use two small flags, one in each hand, and you position them in different configurations in order to communicate the English alphabet. I think you might have to spell the numbers out as in 5 would be "five' instead of '5', which seems a little strange to me, considering all the time you could potentially save. I think I will learn this language for fun!
http://www.wxs.ca/applets/semaphore/