太たい鼓こ鋲びょう

noun

round-headed tack; drawing pin

A small nail or tack with a rounded, drum-like head, used for fastening paper or light materials.

• 掲けい示じ板ばんにポスターを太たい鼓こ鋲びょうで留とめた。

  I pinned the poster to the bulletin board with a drawing pin.