No, for two reasons: as a government work, it is not subject to copyright protection, but also as such a short phrase (one letter!) it could only be protected as a trademark. Which it isn't.
I reckon most people can by filling out loads of forms. But you can't just put a copyright sign on your work for it to valid.
I think the above is not quite right: In the UK and in most of the world,...
The five basic rights that copyright confers are... The right to reproduce the work The right to create derivatives The right to distribute copes to the public The right to perform the work publicly...