the UK's Unix and Open Systems User Group
is a non-profit organization and technical forum for the advocacy of
open systems, particularly Unix and Unix-like operating systems,
the promotion of free and open-source software,
and the advancement of open programming standards and networking protocols.
It aims to cater for all those working in, or interested in open systems and open standards.
It is known as UKUUG (and registered as UKUUG Ltd) not any expanded form of those initials.
If you are interested in Linux/UNIX, open standards, the systems administration of such, etc, UKUUG may be for you.