A traditional almanac containing dates, solar terms, and information about auspicious or inauspicious days; also known as 历书 lì​shū.

In old customs, a formal message sent by the groom's family to the bride's family to announce the wedding date.

(Literary) to communicate with someone through letters or mail.

(Bound form) the title of a classic Neo-Confucian text by Zhou Dunyi of the Northern Song Dynasty, also called 周子通书 zhōu​zǐ​tōng​shū.