tentacle: n. A covert pseudo, sense 1. An artificial
identity created in cyberspace for nefarious and deceptive purposes.
The implication is that a single person may have multiple
tentacles. This term was originally floated in some paranoid
ravings on the cypherpunks list (see cypherpunk), and adopted in a
spirit of irony by other, saner members. It has since shown up, used
seriously, in the documentation for some remailer software, and is
now (1994) widely recognized on the net.