There are 2 circular lines following each other with an arrow on the ends of the circular lines. The are working together as a revolving circle to complete a rotation.
This Synchronize 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.