Ok. It’s time for unsolicited German facts.

The ß or “eszett” (also known as “scharfes s” or “sharp s”) is actually the combination of the old long s (ſ) and a regular s.

ſ + s = ſs = ß

Isn’t that neat? It’s also worth noting that no words start with ß, and it is lower-case only. If you need to write a word with an ß in all caps, replace it with a double s.

Straße -> STRASSE

Edit: not all of this is accurate, apparently. See comments below.