Card-not-present transaction
A card-not-present transaction (CNP, mail order / telephone order, MO/TO) is a payment card transaction made where the cardholder does not or cannot physically present the card for a merchant's visual examination at the time that an order is given and payment effected. It is most commonly used for payments made over the Internet, but can also be used with mail-order transactions by mail or fax, or over the telephone.
Source: Wikipedia — Card-not-present transaction (CC BY-SA 4.0)