Where does “pk” come from?

pk (French) comes from French pourquoi, from Middle French parquoy, from Old French por quoi — why.

pk (French): Abbreviation of pourquoi., why

Definitions

Step	Language	Word	Meaning
1	French	pourquoi	why
2	Middle French	parquoy	why
3	Old French	por quoi	why

pk — Etymology, Origin & Word History | Etymology Explorer