In some song titles there is the letter 'ü', which isn't a letter in the english alphabet, but in the german. What does it mean? Is it some sort of emphasis? An example for such a song title would be 'Yoü And I' by Lady Gaga or 'Where Are Ü Now?' by Justin Bieber.

In some song titles there is the letter 'ü', which isn't a letter in the English alphabet, but in the German. What does it mean? Is it some sort of emphasis? 

An example for such a song title would be 'Yoü And I' by Lady Gaga or 'Where Are Ü Now?' by Justin Bieber.