It’s a simple adapter USB-C male to female, in an angle, making the cable go behind the Deck, so it doesn’t wiggle on top.
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Looks like this thing if someone is looking for a shopping link.
Edit: One of the reviews mentions this is too short for the Steam Deck, so might not be the exact one OP posted a picture of.
This one shows the steam deck in its info
This is the one I got, indeed