The abstract demon head at the top of the page?

bjg · on Dec 4, 2011

Probably one of the "Powered By" logo's http://www.freebsd.org/art.html#POWERED-BY

sophiebits · on Dec 4, 2011

http://www.freebsd.org/logo.html

loopdoend · on Dec 4, 2011

FreeBSD now with more horns less devil. Allow me to play devil's advocate for a second here... wait. What I mean is, the devil's in the details with logo design, seriously. Just be careful not to insult the pious, there'll be hell to pay.

Actually, it would appear the abstracted logo on their page is under a stricter license and requires permission to use, IANAL.