Everyone knows the alphabet has 26 characters. And it has always. Wrong.
The letters we use for English (and many other languages) is constantly in change. Printers often encounter this when they get a group of old type cases and find fonts with some rather odd letters (okay, most printers know what they are). We have changed (and eliminated) some letters over time.
There are also the notation characters that were more commonly in use before computers became more common. One of these is the Pilcrow.
The Smithsonian has a wonderful article written a while ago about this Shady Character (from a book named that - but I just love calling them that anyway!)
And it looks like this:
Worth the short read and a giggle...
And remember, keep being shady, language!