V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):
Unix to Unix Copy Protocol (Unix)
The Free On-line Dictionary of Computing (30 December 2018):
Unix to Unix Copy
(uucp) A Unix utility program and
protocol that allows one Unix system to send files to
another via a serial line which may be a cable going
directly from one machine's serial port to another's or may
involve a modem at each end of a telephone line.
Software is also available to allow uucp to work over
Ethernet though there are better alternatives in this case,
e.g. FTP or rcp for file transfer, SMTP for electronic
mail or NNTP for news.
The term is now also used to describe the large international
network which uses UUCP to pass Usenetnews and
electronic mail, also known as "UUCPNET".
Unix manual page: uucp(1).
See also cu, uuencode.