an IDC connector, pretty standard 0.1", but the male pins sticking out of the bottom are staggered and each one is split into two separate halves, one straight and the other a hook shape. presumably the tip of the hook guides it into the PCB pad and provides some spring compression to maintain good contact. there are also two plastic alignment pegs.
https://files.mastodon.social/media_attachments/files/114/416/928/753/317/118/original/49b2a02303a8195c.png