trica

1. (in basketball) three-pointer
   Pogodio je tricu u poslednjoj sekundi. — He hit a three-pointer in the last second.
2. (digit or route number) three; number three
   Do centra možeš da ideš tricom. — You can take the number three to the centre.
   Napisao je tricu umesto osmice. — He wrote a three instead of an eight.
3. (school grade) a three
   Dobio sam tricu iz matematike. — I got a three in maths.
4. (usually plural) trifle
   Ne gubi vreme na takve trice. — Don't waste time on such trifles.

For «three» as a bus, tram or grade, «trojka» is more common in Serbia.