EDIT: I believe I found the answer, it's something turned by this: https://ctatools.com/products/5065
Found some trash on the street that i'd like to take apart, but this screw is in my way.
It's like a hex bolt, but with 5 sides, and rounded (a bit like flower petals).
Here's another picture from the top:
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I tried turning it with various tools (hard to get pliars in unfortunately), no success so far. The material is very soft, which doesn't help..
That's a star bit screw head. Can find it as a torx star or 5-point star bit.
Torx is 6-pointed tho
People often call variants with other numbers of points "torx" as well. Torx is technically a brand (a trademark) and in that sense, if we were being strict, wouldn't include basically any of the commin TN 6-point driver sets out there, e.g. Wiha and Wera sets. But everyone just says "5 point torx" and so on.
https://www.homedepot.com/p/TITAN-5-Point-Tamper-Resistant-Star-Bit-Set-13-Piece-TIT16137/302134704
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