要

the pin or rivet holding the spines of a folding fan together

(by extension) a pivot, cornerstone, keystone

a pin, often decorated, holding the handle to the tang of a katana

short for 要黐 (kaname mochi), a kind of tree, the Japanese photinia or Photinia glabra

(architecture) in a certain kind of traditional Japanese hip roof where the rafters splay out like the spines of a fan, the central point to which the rafter lines converge