I suspect they incorporated two different pre-existing symbol sets - the Greek alphabet and a set of scientific symbols. Added - they did; here is an older ver

I suspect they incorporated two different pre-existing symbol sets - the Greek alphabet and a set of scientific symbols. Added - they did; here is an older version (3.0) of the standard online http://www.unicode.org/book/u2.html http://www.unicode.org/book/u2.html