Canada: An electronically generated numeric or alpha-numeric code that can be used as an ATS system confirmation of message delivery and receipt. It can also be used as a message reference number. For example, when acknowledged by the pilot-in-command (PIC), it confirms that an IFR clearance issued to an aircraft via data link under the pre-departure clearance (PDC) programme has been correctly received.

Note: This abbreviation is pronounced "fe-POO-i."