VGA-C: a pinout for VGA's DB-15 where a second copy of it has been added, rotated 180 degrees. The pinout shares 6 between both copies, but otherwise there's simply a second copy of all the pins. The edges of the DB-15 (now DB-29) have also been adjusted so that they both tilt the same way, to allow it to be inserted either way. Above and below the port there's an icon for "monitor"
https://digipres.club/system/media_attachments/files/113/382/857/164/039/040/original/887cd2d9124a40f0.png