What is "hatpins"

Usage examples of "hatpins".

A little red hat was attached by twenty long hatpins to her coarse dark hair, and she had a red skirt stiff and thick as a carpet.

Suspended from a web of delicate threads hang silverware, hatpins, and peacock feathers, silk cravats, plastic figurines, and artificial flowers.

One pulls open the bottom drawer and they study the array of hatpins still left to them.