three calligraphy styles
Refers to the three fundamental styles of Japanese calligraphy: kaisho (square/block), gyōsho (semicursive), and sōsho (grass/cursive). Often used in contexts of learning or comparing calligraphy.
In calligraphy class, we learn how to write the three styles.
three-body problem
From 三 (three) + 体 (style/form). The term is specific to Japanese calligraphy, referring to the three main script types.