piątka

1. five (digit or figure)
2. five (a set or group with five elements)
3. something assigned the number five: bus line, road, candidate on a ballot, etc.
4. (colloquial) high five
5. A (the letter grade assigned) [+ z (genitive) = in what subject]
6. (colloquial) goal area (area of the pitch, extending six yards from the goal, from which a goal kick is taken)