Any Sheffielder - native or adoptive - will know the answer to this, but here's a spot the difference for the rest of you.
I was going to give the answer tomorrow, but as no one so far has even had a go at it, I shall keep you in suspense until Sunday. After tomorrow night, Sheffielders, if no one else has cracked it, you are welcome to show off your knowledge.
(It's nothing to do with bridge numbers)
It's not a pub.
It's not Meadowhall.