Nine digit code used by the
Unabomber in his correspondence with the
media and
law enforcement. Such codes are typically used by criminals and
terrorists so the authenticity of their messages can be verified. The code is kept secret from the public, of course.
This particular code is the
social security number of a
petty criminal from
California. That man has a
tattoo that says "
pure wood". Probably a coincidence or a false trail planned by the Unabomber.