1. in 1977, "carbon copy", for the pre-photocopier way of manually making copies of a letter
2. now, "courtesy copy"; either a 2nd copy of a letter or of an
email sent to another recipient
Related to BCC Blind carbon/courtesy copy -- referring to
extra copoes secretly sent to others.
1. Remember those old triplicate forms when you made 2 carbon copies at the same time as an original?
2. When sending mass forwards of a funny joke or
email,
don't put everyone in the CC field, as that's risky for spam & viruses; use the BCC field for their emails & put your own in the TO: