1. 
   RA-2
   acronym: POEM altimeter (ESA)
   Found op http://cdiac.ornl.gov/pns/acronyms.html#R
   
   
2. 
   Ra(OH)2
   Radium Hydroxide Molar mass: 7687.31768
   Found op http://www.convertunits.com/molarmass/Radium+Hydroxide
   
   
3. 
   R²
   (Reality Regenerator) A picture improvement system producing clear and natural images on your TV screen. The edges of objects, which may be blurred after recording, are restored by the system.
   Found op http://www.sony.co.uk/glossary/ShowGlossary.action?site=odw_en_GB§ionty
   
   
4. 
   RA2
   ISO paper size 430 x 610mm.
   Found op http://www.tso.co.uk/solutions/publishingsolutions/printproduction/printglo
   
   
5. 
   RaBr2
   Radium Bromide Molar mass: 385.808
   Found op http://www.convertunits.com/molarmass/Radium+Bromide
   
   
6. 
   RaCl2
   Radium Chloride Molar mass: 296.906
   Found op http://www.convertunits.com/molarmass/Radium+Chloride
   
   
7. 
   radon-222
   (from the article `radon`) Natural radon consists of three isotopes, one from each of the three natural radioactive-disintegration series (uranium, thorium, and actinium ... ...a nuclear decay reaction, and release mainly alpha particles. The series starts with uranium-238. The nuclear disintegratio...
   Found op http://www.britannica.com/eb/a-z/r/5
   
   
8. 
   RaF2
   Radium Fluoride Molar mass: 263.9968064
   Found op http://www.convertunits.com/molarmass/Radium+Fluoride
   
   
9. 
   Ragnarok Online 2
   Historical Fantasy MMORPG game: Ragnarok 2 is the sequel to Ragnarok, it is based around the Norse mythologies with western and far eastern stylings
   Found op http://www.xrpg.com/game/Ragnarok%20Online%202
   
   
10. 
    RaI2
    Radium Iodide Molar mass: 479.80894
    Found op http://www.convertunits.com/molarmass/Radium+Iodide
    
    
11. 
    RAV12
    A monoclonal antibody that is being studied in the treatment of some types of cancer. Monoclonal antibodies are made in the laboratory and can locate and bind to cancer cells. It binds to a carbohydrate (sugar) molecule that is found on gastric, colon, pancreatic, prostate, ovarian, breast, and kidn...
    Found op http://www.cancer.gov/dictionary?expand=R
    
    

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