Yea, I know that's what it does I just didn't know what to call itI think you could call it the "fit to content" button.
The green "+" button doesn't exactly maximize the window, but rather makes the window maximize to fit all the content within it. So, rather than making Safari full screen, clicking the button will increase the size of the window to fit all the information for the webpage you're looking at.
Make sense? It's not exactly maximize, but for the sake of what you're doing, I think it'd be okay to call it that.
it's called the zoom button. Don't ask me why.