faucet
https://gyazo.com/663c86cd7ec13f1ed40c4c05215d0934
https://www.brickers.jp/?pid=34751254
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.
Lamp Holder - Faucet - Stud
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