Giboshi are attached to newel posts (major posts placed at both ends of a balustrade and at constant intervals), and such posts are called "hojubashira" (literally, post of a sacred ball-shaped gem).
擬宝珠が取り付けられるのは親柱（両端および一定の間隔で並ぶ主要な柱）であり、「宝珠柱」という。