The key link or most important part of something; a general outline, summary, or program

A level in biological classification, ranking below phylum (门 mén) and above order (目 mù)

(bound form) the main rope of a fishing net.

(archaic) a historical term for a group or convoy transporting bulk goods like tea, salt, or stones.

Social order, ethics, or discipline, as in the traditional Confucian codes of conduct 三纲五常 sān​gāng​wǔ​cháng