So this is my first redstone project.. it's a redstone 7 segment display with keyboard. That means, it has numbers from 0 to 9 and letters from A to Z. Just turn on the switch under the letter you want to display and that's it. I don't know if there is others displays like this, but this one is made by me and it works really good.
So you can do anything you want with this display.. You can clone it with MCEdit and use it for displaying words, codes, idk..

So I hope you enjoy! :)