Why do people use this G as a favicon?

I have seen many websites, such as http://www.technoblip.com, using this image as their favicon.ico. It is like a white capital G in a black circle as shown in the image.

What is this from? Is there any special meaning of this favicon?

Solution

It looks like it's the standard favicon/logo from Genesis Framework, a framework for WordPress sites and used on the site you mentioned in your comments. It can be found on that site at http://www.technoblip.com/wp-content/themes/genesis/images/favicon.ico:

Not really a hidden meaning or anything.