Index Icon in Material Style

This Index 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 4,900 icons, all in the same style and quality.
There are 3 lines to this logo. They all look the same. Each has a small square. Beside the small square are 2 straight lines. The line on top is a little longer than the one at the bottom.