Compass
Minimal icon theme for Linux.
https://github.com/Nitrux/compass-icon-theme
Icons are licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Compass is a freely distributed minimalistic squared set of thousands of SVG icons with support for GTK+ and KDE Plasma desktop environments. Compass supports GNOME, Xfce, MATE, LXDE, or Cinnamon and the KDE Plasma desktop environment. It has SVG icons for almost all of the open-source applications that are installed on your GNU/Linux systems.