haha.....AutoCAD!

"In an ironic twist of fate, the cyber technology of the 80's is recycled into a tried and true medium for data storage. The Nerd Journal is 50 pages (25 sheets) of 110 lbs. smooth surface ivory or green paper compressed between two 5.25" floppy disks. Great for pencil, pen, ink, marker, acrylic and ...practicing long hand division. Each wire bound journal is handmade with unique vintage labels.

5.25" x 5.25" x 0.5"
50 pages / 25 sheets"

Found at Violentiris' Etsy shop.