Japanese crossword «Profession (rebus in Russian)»

I'm stumped: I've got pi, a head of church (king? bishop?), and an equation u = c, possibly speed of light?
Just a hint? Am I on the right track?

If you're stumped and you understand Russian, go to nonograms.ru. If you don't understand Russian, you won't be able to solve this. :)

Nicely done; Clerk. It's like '4 King & Country' logo. Logic is required to solve this anagram

I speak some Russian, so I followed Sheryl Hill's suggestion and went over there. That's a pi, and the king is a tsar, and the Russian commenters all got pi + tsar = pisar, which means "clerk". None of the commenters said anything that I could understand about the equation down in the corner. I did some Googling using a couple options for the letters (the u could be a couple different things, the c is definitely a c which in Russian is an s) but I didn't find anything - I sort of thought, IDK, it could be some standard accounting equation like something you'd find on a profit and loss sheet?? Whatever, all of the Russian commenters agreed it was definitely a rebus for a clerk. ...Which Kira M also said above, but I didn't get it immediately. Sorry Kira!

Fun to work

low enjoyment quotient for an english speaker

not bad