thumbtack

nasta

kiinnittää nastalla A small nail-like tack with a slightly rounded head that can be pressed into place with light pressure from the thumb; used for hanging light articles on a wall or noticeboard
puhekieltä To fix or attach something with a thumbtack.
1988, (w), (w), New York: Vintage International, 1994, Chapter One,

On the particle-board partition that separated his cubicle from the next, Paul had thumbtacked things that might inspire him (..)