This Tick Box 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.
This is a checkmark inside of a square with rounded corners. The square has four normal sides and three normal corners, but the top-right corner is open. The checkmark's tail would meet the top right corner if the square was complete.