Japanese calligraphy paper; hanshi
Standard-sized paper (approx. 25 cm × 35 cm) used for calligraphy practice and brush writing.
書道の授業で半紙に漢字を書いた。
In calligraphy class, I wrote kanji on hanshi paper.
straw paper; inexpensive rough paper
improved hanshi; type of Japanese calligraphy paper
From 半 (half) + 紙 (paper), referring to the standard size being roughly half of a traditional full sheet.