From: utzoo!decvax!cca!dan@Bbn-Unix@sri-unix
Newsgroups: net.unix-wizards
Title: Re: Naming Conventions for System Libraries
Article-I.D.: sri-unix.3409
Posted: Tue Sep 21 22:56:52 1982
Received: Wed Sep 22 04:58:14 1982

From: Dan Franklin 
Date: 17 Sep 1982 13:01:14 EDT (Friday)
This is a good point.  UNIX is actually quite unusual
in not having such a standard prefix for system names.
As a matter of C trivia, there are three printing ASCII
characters not used anywhere in the language: dollarsign,
at-sign, and backquote. Dollarsign seems like a reasonable
choice for such a separator.