Tux, the Linux penguin.
Original artwork: Larry Ewing (lewing@isc.tamu.edu), created with The GIMP.
Vector artwork: Larry Ewing, Simon Budig, Garrett LeSage.
Source: https://commons.wikimedia.org/wiki/File:Tux.svg

These drawings are copyrighted by Larry Ewing and Simon Budig
(penguin-variant.sk also by Anja Gerwinski), redistribution is free but
has to include this README/Copyright notice.

Larry Ewing: Permission to use and/or modify this image is granted
provided you acknowledge me lewing@isc.tamu.edu and The GIMP if someone asks.
Garrett LeSage's contribution is CC0.