Homonym: Ø (Empty)
The letter "Ø" is a character used in several languages, including Danish, Norwegian, and Faroese. It represents a vowel sound that is similar to the "i" in "bird" or the "u" in "fur." In the International Phonetic Alphabet, it is denoted as a close-mid front rounded vowel.
In mathematics and set theory, "Ø" is also used to symbolize the empty set, which is a collection that contains no elements. This notation helps in various mathematical expressions and proofs, indicating that there are no members in the specified set.