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- "Pierwolf" – USS Seawolf
- "The Pool" - HMS Liverpool
- "Proud Pete" - USS Peterson; play on "Pete" as a diminutive of "Peterson", and on the ship's motto, "Proud Tradition"
- "Prune Barge" - USS California
- "Puffington" - HMS Effingham
- "Puuhamaa" - Finnish navy minelayer Pohjanmaa. An ironical remark of Puuhamaa amusement park.
- "Pepper Pot" - HMS Penelope - while docked in Valletta harbour, during the Siege of Malta, she was bombed so much she resembled a pepper pot
Read more about this topic: List Of Warships By Nickname