P

• in RVR indicates visibility greater than highest reportable sensor value (e.g. P600FT)

  METAR

• Pacific Standard Time (time group only)

  Weather

• polar (air mass)

  Weather

• prohibited area

  ICAO

P has 4 meanings; the right one depends on context. A weather report, a NOTAM or an ATC clearance. Got a NOTAM full of contractions? Paste it into the decoder.

Source: FAA Order JO 7340.2 Contractions. Not for operational use.