[MacBerry]

I tend to think those icons represent contexts better than they do perspectives, though of course that depends how you set up your perspectives.

I have no idea what each was meant to mean, though of course it's up to you what you want them to mean.

You can use any icon you want by the way, either by clicking "choose", or more easily by clicking the icon in the perspectives window, then pasting another icon onto it. I've copied several from folders and apps to use.