This is a Debian icon. We've made it in iOS style, first introduced in iOS version 7 and supported in all later releases up until now (at least iOS 11). This style is based on thin two-pixel lines and is optimized for 50x50 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 13,300 icons, all in the same style and quality.
Idea of Debian Icon by Viktor
We've received the idea on July 4, 2013 and created the icons on December 16, 2013
OS Brands and Architecture Icon Set 2
It would be great if you extend these icons to your OS collection: Debian Mandriva RedHat SuSE Android Symbian.