A rather old system of measurement whereby unit ratios are not based on ten, but rather (at least in the case of volume), 2. Note:
1 barrel = 2 strikes
1 strike = 2 bushels
1 bushel = 2 buckets
1 bucket = 2 pecks
1 peck = 2 gallons
1 gallon = 2 pottles
1 pottle = 2 quarts
1 quart = 2 pints
1 pint = 2 cups
1 cup = 2 gills
1 gill = 2 wine glasses
1 wine glass = 2 fluid ounces
1 fluid ounce = 2 tablespoonse
1 tablespoon = 2 dessert spoons
1 dessert spoon = 2 drams
1 dram = 2 pinches
1 pinch = 2 dashes, etc...