Everyday compound:
发髻 (hair bun) - the term you will read in novels, fashion writing, and bridal-hair tutorials. Specialised forms include
椎髻 (mallet-shaped bun, the standard Han-Chinese style),
双髻 (twin buns - the classic young-girl hairstyle in period dramas),
高髻 (tall bun, characteristic of Tang court ladies). In premodern China both women and men wore
髻 - men adopted a topknot at the coming-of-age ceremony, and an unbound head was a sign of mourning or chaos.