Zed

Because it's the end.
Firstly, do you ever think about how much a thing will change? I mean, the alphabet for instance. In England, the expression is "A to Zed" but then Americans had to create their own thing and make it "A to Z". Not that I have a problem with people changing things but, honestly, why was that necessary?
Secondly, I'm really impressed with everyone who managed to complete this challenge. Here's a round of applause for you. (Applause).
Thirdly, thank you Kris for bringing my attention to this challenge. It was a lot of fun :)

See you on the flip side