This Open Source 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 4,300 icons, all in the same style and quality.
The icon is basically identical to the logo used by the Open Source Software community. The Open Source Software community is a collection of developers who work toward the creation of software and tools whose source code is released with a permissive license, for all to use and modify with few restrictions.