folding book
counter for units of paper and nori (48 pages of Mino paper; 20 pages of hanshi; 10 sheets of nori)
counter for folding books, folding screens, shields, etc.
counter for pairs (of curtains)
counter for tatami mats
tatami mat (esp. as a measure of room size, either 1.82 sqm or 1.54 sqm)