Carbon copy
Carbon Copy is produced when a sheet of carbon paper is placed between two sheets of writing paper. As a pen, pencil, or typerwriter element presses down to write on the first sheet, exactly the same writing appears on the second sheet. The same is true if the two sheets of paper and carbon paper are placed into a typerwriter to generate two copies of a document. People would type "cc" at the bottom of the paper to show where the carbon copy was sent. When people began using email, the carbon copy (cc) shows that the same email is sent to more than one person.
Carbon Copy Media
As creating carbon copies requires relatively few resources, it became a common method for producing underground and clandestine newspapers, as seen in this French example from World War II.
Menu for the Blackpool Tower Café Restaurant, with daily specials (in blue) carbon copied, early 20th century.
Typed carbon copy letter from 1919, with stamp reading "A true copy of the signed original."
