What is this icon on an iPhone?

Copy paste the link to see the picture. It's the transparent icon with the circles in the middle. What is it? I always see it when people screenshot pictures. I have an iPhone but I don't have it.

That is the accessibility mode button. If you broke your phones button or something went wrong you can enable this and by clicking it you can accomplish certain tasks without doing them with the hardware such as sleeping the phone and clicking the home button.

That means you turned on your assistive touch. It's just to do stuff without pressing buttons on the actual phone. To turn it on go to general then accessibility then assistive touch. It should be like that for and iPhone 4

It's assistive touch. It's basically a perk now since you can use it to replace buttons;volume, home, sleep buttons. This is meant for the disabled that have to make many hand movements but aren't actually able too. This has given them shortcuts to actually using an iPhone with limited movement.

This can be taken off in Settings>General>accessibility >assistive touch

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