1.
writing brush; calligraphy brush
A brush made with animal hair used for calligraphy and traditional East Asian painting. Also refers to the style of writing done with such a brush, as opposed to pen or pencil.
Usage
毛筆 refers both to the physical brush instrument and to the practice of writing with a brush. In Japanese schools, 毛筆 is taught as part of 書写 (penmanship) classes starting in third grade.