Paper measuring 11 inches wide and 17 inches long is called either tabloid or U.S. B, ANSI B or short grain. Paper that measures 17 inches wide and 11 inches long is referred to as ledger or long grain but is still considered U.S. B and ANSI B.
The American National Standards Institute defines five different sizes of paper from E through A. Each smaller size is half the size of the previous size. The largest is the E size, which is 44 inches long and 34 inches wide. The next size is D, which measures 22 inches long and 34 inches wide. The B size, which is 11 inches wide and 17 inches long, is one-eighth of an E size. The only exception to this standard is government letter size, which is 8 inches wide and 10.5 inches long.