This is the 16024th most frequent Polish word.
trójka
The Polish word "trójka" means "three" or "a group of three."
In this context, "trójka" represents the numeral three as part of a larger number.
Trójka z numeru mieszkania była częściowo zamazana.
The three from the apartment number was partially smeared.
In this sentence, "trójka" indicates a group of three individuals—students.
Trójka uczniów zdecydowała się pojechać na wycieczkę.
Three students decided to go on the trip.
Here, "trójka" refers to a grade or score, commonly used in the Polish education grading system.