Here's an analysis of the logo of Cern, the European Organisation for Nuclear Science.

Whilst it doesn't explicitly prove anything, the 666 encoded in this symbol cannot have been accidental. They must have been aware of what they were representing.

So what does it mean? Sadly I don't know. Anyone who tells you they do should be viewed with suspicion. The only thing I can tell you is that having 'the number of the beast' encoded in such a logo is not good for humanity. More people need to be asking questions...