What is this key?

[Reality]

This is a very very very simple question to the smart users out there I'm sure, but that's not me. I use a logitech keyboard and for the longest time, I wanted to know what this key right here is.(see attachment below) I see it being used in all kinds of apps but I don't know what key it is on my keyboard since I don't have that symbol.

 

[ElDiabloConCaca]

It's the option (or "alt") key. On a PC keyboard, I don't know what it's counterpart is.

 

[Reality]

Ok thank you. It was just a really weird looking symbol and my guesses were somewhere along the lines it's the shift key or something.