Idea of BlackBerry World Icon
It's a logo of Blackberry App World reduced to the blackberry icon. The icon is enclosed by a circle the borders the logo. It pretty much looks like the same Blackberry icon on the back of all of the blackberry cell phones.
This BlackBerry World icon is made in Material Design style
developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 6,200 icons, all in the same style and quality.