noun
insect pin; setting pin
A thin, sharp pin used especially for mounting insects in collections, but also for temporarily holding fabric or other light materials in place.
標本を作るために、チョウを虫ピンで固定した。
I fixed the butterfly with an insect pin to make a specimen.
布がずれないように虫ピンで留めてください。
Please secure the fabric with setting pins so it doesn't shift.