A silly question
have a look here: Partial derivative - Wikipedia, the free encyclopedia
By the way: Your signature should be printed like this:
I'm going to try:
Obviously no . So sorry!
You have to use a typographically correct font with 2 different characters of "s" depending where it is placed in the word. Additionally you have to use ligatures between "s" and "t", double "l" (that's a lower case of a capital L), "f" and "t" and in German there are a few characteristical combinations of letters: "sch" or "ch" or "ck"...etc.
In the font I use (it is obviously not the font of the MHF) you find those exceptional characters at places of brackets or the @-sign.