Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • abbreviation Sports penalty
  • abbreviation promissory note

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The ISO 3166-1 two-letter (alpha-2) code for Pitcairn.
  • noun metrology Symbol for the petanewton, an SI unit of force equal to 1015 newtons.
  • initialism part number
  • abbreviation astronomy planetary nebula

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