In 8-handed Stud, a face-up 7th card in the middle that everyone uses.
8 players × 7 cards = 56, which exceeds 52, so before 7th street, if fewer cards remain than players left, first skip the burn card; if that's still not enough, deal the single shared card. The player whose board is strongest including that card acts first. It's rare for 6 or more players to reach 7th street, so this seldom happens. It can't happen 6-handed (6 × 7 = 42 cards).