International Bittering Units. They measure how bitter a brew is, which you shouldn't worry much about since you'll be making mead, not beer. A keen way of exchanging information between geographically distant parties. Computer and modem required. A measure of the color of a brew.
Higher numbers are darker.
An alcoholic beverage made by fermenting honey. Also known as meathe in older tymes. It's alcohol with only as much water as is required by the laws of physics. About 192 proof. Fermented beverages are icky straight out of the fermenter and need some aging to taste good.