Source: http://www.quora.com/Computer-Keyboards/What-is-the-origin-o...
I would wager that this was the first use of the symbol to denote this purpose.
Interestingly enough, the symbol hasn't been widely explicitly mentioned in menus in Apple's OS until relatively recently (OS X). Option was always that special easter egg of a key that half of Mac users still never used or realized existed.
When I searched google the first link is:
http://www.quora.com/Computer-Keyboards/What-is-the-origin-o...
You can probably find some more links here:
http://lmgtfy.com/?q=what+is+the+origin+of+apple%27s+option+...
Please don't treat other people this way on HN. It's mean, and it corrodes the site for all of us.
I typed the AskHN title verbatim into google and was presented with a number of pages that explained the origin of the symbol.
People frequently ask questions on HN that Google could "answer". When those questions spark interesting conversations, they get voted up. Otherwise, they fall off the front page.
A better thing to do than acknowledging that you were rude and then explaining why you decided to do that would simply be to apologize.