minoban (paper size, 273×394 mm)
A traditional Japanese paper size, larger than A3. Used mainly for documents, calligraphy, and art.
This document is printed on minoban-size paper.
B4 (257×364 mm) is a Japanese standard size, slightly smaller than minoban.
Named after Mino Province (美濃国), historically known for high-quality paper production. 判 (はん) means 'size' or 'format'.