The letter ø (Ø in capital) is used in Norwegian and Danish. It is a vowel and is pronounced like the U in the English word "burden" or like the I in "Sir" (or even like the O in "word"!). It is the 28th letter of the Norwegian alphabet.

Example of its use in Norwegian:
Prøver du å ødelegge døra? (Are you trying to destroy that door?).