jargon A term invented to distinguish a subclass of things
from new members of the superclass, where the distinction was
previously not necessary, since the old subclass had been all
there was of the superclass.
were coined by those for who "mail" was likely to mean
While the English language in general has a few retronyms
("whole milk", "snow skiing", "acoustic guitar"), hacker
jargon is necessarily (at points capriciously) rich in
[More examples?]
(2001-02-25)