This is the 3472nd most frequent Turkish word.
mü
The Turkish word "mü" is an interrogative particle used to form yes/no questions.
The particle 'mü' is used as a question particle here, converting the statement 'O yeni filmi gördün' (You saw the new movie) into a question.
O yeni filmi gördün mü?
Did you see the new movie?
Here, the word 'mi' (a variant of 'mü' depending on vowel harmony) is used for questioning about a preference between options provided.
Bu kitap mı yoksa diğeri mi daha iyi?
Is this book or the other one better?
In this sentence, 'mi' contributes to the phrase 'değil mi', forming a tag question to confirm what was stated.