This is the 16026th most frequent Polish word.
tróję
"Tróję" is the accusative form of "trója," which means "a grade of three" (equivalent to a mediocre score or 'C' in some grading systems).
Here, 'tróję' refers to a school grade, specifically the grade 'C' in the Polish grading system, which ranges from 2 to 5 where 2 is the lowest passing grade and 5 is the highest.
Mam na świadectwie tylko tróję.
I have only a grade C on my report card.
In this context, 'tróję' represents the number three as a score achieved in a board game.
W grze planszowej zdobyłem tróję.
In the board game, I scored a three.
Here, 'tróję' refers to the numeral three drawn or depicted on a sheet of paper.