ABV and IBU's 

Alcohol by Volume

Percentage of ethanol, the intoxicating component found in beer, usually perceived as a warming sensation.  The State of Ohio limits the alcohol production by breweries to approximately 7.5% ABV.  This allows us to brew all but a few styles like barly wine and a few high alcohol books.

Examples for Comparison:

1. Bud Light - 3.3% ABV
2. Bass Ale - 4.7% ABV
3. Samuel Smith's Taddy Porter - 5.1% ABV

International Bitterness Units

Accepted method of expressing hop bitterness in beer.  Simply, the higher the number, the more bitter the beer will be.   Scientifically, it is the dissolved iso-alpha acids expressed in parts-per-million.