TUX is a kernel-based, threaded, extremely high-performance HTTP server. It is able to efficiently and safely serve both static and dynamic data. TUX moves the HTTP protocol stack to the kernel, and can handle requests for data with both kernel-space and user-space modules.

Linux's official mascot, a penguin.

Penguin, mascot of Linux. Its name is rumored to come from both "tuxedo" and " Torvalds UniX".

semiformal evening dress for men

This is a formal or semi-formal men's black evening jacket that may be either single-breasted (1-4 buttons) or double-breasted (2-6 buttons).

Shortened form of tuxedo.