The letter "Ö" is a vowel used in several languages, including German, Hungarian, and Turkish. It represents a sound that is similar to the English "o" but pronounced with rounded lips. In German, it can appear in words like "schön" (beautiful) and "könig" (king). In Hungarian, "Ö" is also a distinct vowel and is used in words such as "tör" (to break) and "kör" (circle). The letter is important for proper pronunciation and meaning in these languages, as it can change the meaning of words when replaced with other vowels.