trojka

1. (school grade) a three, the middle grade on the Serbian 1–5 scale; roughly a C
   Dobio sam trojku iz matematike. — I got a three in maths.
2. number three; the number 3
   Do centra idem trojkom. — I take the number 3 to the centre.
   Tvoja trojka liči na osmicu. — Your three looks like an eight.
3. (in basketball) three-pointer
   Pogodio je trojku u poslednjoj sekundi. — He hit a three-pointer in the final second.
4. trio; group of three
   Ta trojka je uvek zajedno. — Those three are always together.
5. (in plural) triplets
   Komšinica je rodila trojke. — Our neighbour gave birth to triplets.
6. colloq. (of sex) a threesome
   Predložio joj je trojku, a ona ga je odbila. — He suggested a threesome, and she turned him down.

In Serbian schools the grade 3 is called "dobar" and counts as average.