1. 
   zrn
   (from the article `African music`) ...have spread around the northeastern and northwestern fringes of Africa wherever Islam has taken root. Despite local variations, they are basically ... ...function, a shared physical characteristic, or an association with a particular social class. Instrument dis...
   Found op http://www.britannica.com/eb/a-z/z/12
   
   
2. 
   ZrN
   Zirconium Nitride Molar mass: 105.2307
   Found op http://www.convertunits.com/molarmass/Zirconium+Nitride
   
   
3. 
   ZRN
   The ISO 4217 currency code for the Zaire New Zaire.
   Found op http://www.duke.edu/~charvey/Classes/wpg/bfglosz.htm
   
   

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