The Port of P'nam was a location on Rigel IV, the Rigel Trading Planet.
Starships and shuttles visiting Rigel IV that passed the Inspection Party were directed by Rigel Space Control to land at the Port of P'nam. However, in practice, this could be anywhere on the surface of the planet that Rigel Space Control directed them to. If it had once been a real place, it either no longer existed by the 23rd century or had expanded to cover the entire planet. (FASA RPG module: The Orions: Book of Common Knowledge)