Format of letters after one's name

What’s the rule on this, if any? Is it in the same sized font or do the letters have to be a little bit smaller?

Same size is fine.

superior performance

use a 12 inch font…

Has to be Wingdings.

Not completely true anymore. Per a 2012 revision, Wingdings, Wingdings 2, and Comic Sans are the ONLY permissible fonts when using the designation.

I thought according to CFA ethics its supposed to be twice the size of your name?

^ +1

That way you are able to show superior investment performance