This Small Icons 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 4,400 icons, all in the same style and quality.
The small icons are represented by many tiny different images or icon. For example, there may be symbols for clouds, suns, mountains, flowers, etc. The images inside the icon are small and is surrounded by a square.