Translation guide
A short pin with a flat, broad head, used for fastening paper to a wall or board.
The common small pin with a flat head used on bulletin boards.
The same object, but using the American English term.
Same as above; Japanese does not distinguish between 'drawing pin' and 'thumbtack'.
押しピンが足りないから買ってきて。
We're out of drawing pins, so go buy some.
Put the thumbtacks back in the box.