nprofile1qyt8wumn8ghj7un9d3shjtnyd968gmewwp6kytcqyzujmnq8uxljl8l5m30p6kf69nnnerpz4tq2urwm62lz7qa34rk4xe4998y (nprofile…998y)
Not positive, but I think it's called a button pin.
https://en.wikipedia.org/wiki/Pin-back_button#:~:text=A%20pin%2Dback%20button%20or,a%20clutch%20or%20other%20mechanism.