1. 
   HW
   abbreviation: Heavy Weight
   Found op http://www.apscharts.com/abbrev.html
   
   
2. 
   HW
   Hardware / Hand written, details ...
   Found op http://www.cryer.co.uk/glossary/h/index.htm
   
   
3. 
   HW
   Heated Windshield
   Found op http://www3.sympatico.ca/dhaughey/j1930.htm
   
   
4. 
   HW
   HW can signify: == In entertainment == == In transportation == ...
   Found op http://en.wikipedia.org/wiki/HW
   
   
5. 
   HW
   (initial) Heavy Water.
   Found op http://wiki.eveonline.com/en/wiki/Glossary
   
   

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