1. 
   PN
   abbreviation: prior notice
   Found op http://www.apscharts.com/abbrev.html
   
   
2. 
   PN
   Processing Node
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
3. 
   PN
   Prevention Network
   Found op http://www.encyclo.co.uk/local/20895
   
   
4. 
   PN
   See: Project notes
   Found op http://www.duke.edu/~charvey/Classes/wpg/bfglosp.htm
   
   
5. 
   PN
   The two-character ISO 3166 country code for PITCAIRN.
   Found op http://www.duke.edu/~charvey/Classes/wpg/bfglosp.htm
   
   
6. 
   PN
   Type: Abbreviation Definitions: 1. Abbreviation for practical nurse.
   Found op http://www.medilexicon.com/medicaldictionary.php?t=70235
   
   
7. 
   pn
   (networking) The country code for Pitcairn Island. (1999-01-27)
   Found op http://foldoc.org/pn
   
   
8. 
   PN
   a symbol for 'nominal pressure,' a measure used for rating piping, valves, fittings, etc. Nominal pressure is essentially the pressure rating of the piping system, measured in bars at a temperature of 20 °C (68 °F). (One bar equals 100 kilopascals or approximately 14.5038 pounds per square inch in...
   Found op http://www.unc.edu/~rowlett/units/dictP.html
   
   

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