rpn

/AA1 R P IY1 EH1 N/
noun
  1. 1

    (computing) Initialism of reverse Polish notation. [(arithmetic) An arithmetic notation in which numbers precede the operators to be applied to them.]

  2. 2

    (project management) Initialism of risk priority number.

  3. 3

    (Philippines, broadcasting) Initialism of Radio Philippines Network.