Idea of Unlock Icon
It's an icon of a lock. There is a circle to represent the lock mechanism, with a small black circle with a rectangle extending from the bottom to represent the keyhole. A curved line extends from the top left of the large circle, and arches almost all the way to the right, to represent an open lock.
This Unlock icon has Android KitKat style
. If you use the icons for Android apps, we recommend using our latest Material Icons icon pack (please check our sidebar on the right). Otherwise, it's a solid icon pack that looks good in small resolutions, either on the web or in print. It's characterized by thick lines, smooth corners, and is optimized for 24x24 pixels.