What notations are included at the bottom of a letter to send a copy of the letter to another individual with the recipients knowledge?

At the bottom of a letter, you can include the notation "cc:" followed by the name(s) of the individual(s) receiving a copy of the letter. This stands for "carbon copy" and indicates that the recipient is aware that others are receiving the same correspondence. You may also list the names or titles of those receiving the copies for clarity.