I looked at Importing a Single Symbol From a Different Font and Handwritten R-like-kay. As a result, I downloaded the STIX package and looked up the highly welcome curly k
\kay and found it to have the "coordinates"
stix-mathscr (on page 37 of the newest documentation v1.1.1-latex from 2014/07/3); they are:
15x, ''6x '3
What does this signify and how can I use it to import it? I guess the actual code would be similar to the answer in Importing a Single Symbol From a Different Font. Sorry, if the question is a bit redundant, but I think for non-experts the whole symbol importing business is pretty hard to understand.