Twenty-four what

Twenty-four solar terms, twenty-four histories and twenty-four filial piety.

Twenty-four solar terms: beginning of spring, rain, fright, vernal equinox, Qingming, Grain Rain, Changxia, Xiaoman, Mangzhong, Summer Solstice, Xiaoshu, beginning of autumn, Chushu, Bailu, Autumn Equinox, Cold Dew, Chufrost, beginning of winter, light snow, heavy snow, winter solstice, slight cold and severe cold.

Twenty-four histories: Historical Records, Hanshu, History of the Three Kingdoms, Book of Jin, Book of Song, Book of Nanqi, Liang Shu, Book of Chen, Book of Wei, Book of Beiqi, Book of Zhou, Sui Shu, History of Nan and Old Tang.

Twenty-four Filial Pieties: Xiaogan moves heaven, plays colorful games to entertain relatives, deer milk serves relatives, Li Bai bears rice, bites fingers, clothes follow mothers, tastes soup and medicine, picks up exotic objects, buries children to serve mothers, sells his body to bury his father, carves wood to serve relatives, jumps carp in the spring, keeps relatives with orange flowers, warms pillows, serves as a maid for mothers, and hears the tomb with shock.