Matrix: n. [FidoNet] 1. What the Opus BBS software and sysops
call FidoNet. 2. Fanciful term for a cyberspace expected to
emerge from current networking experiments (see the network). The
name of the rather good 1999 cypherpunk movie "The Matrix" played
on this sense, which however had been established for years before.
3. The totality of present-day computer networks (popularized in
this sense by John Quarterman; rare outside academic literature).