Philippine National Railways

Photoreceptor cell-specific nuclear receptor

Partidul Naţional Român (Romanian National Party), a political party.

Passenger Name Record, an airline's record of a passenger's travel details.

point of no return (Aviation technical jargon)

Park and Ride

Partido Nacional Renovador (National Renovator Party), a Portuguese political party.

Policía Nacional Revolucionaria Cuban national police force

Penrith railway station, England; National Rail station code PNR.