Hard to guess the name from the shape. I thought it was a megaphone.
-
It can be grabbed with clip (paper, surgical, etc.) and acts as a stud, allowing for compact and tricky placement.
This page is auto-translated from /nishio/蛇口 using DeepL. If you looks something interesting but the auto-translated English is not good enough to understand it, feel free to let me know at @nishio_en. I’m very happy to spread my thought to non-Japanese readers.