The Greek letter IOTA, which is represented by the symbol ι, is the ninth letter of the Greek alphabet. It is also the smallest letter in the Greek alphabet and is pronounced as a short 'i' sound. IOTA is often used to represent the number 10 in mathematics and is also used in various other contexts. In Greek mythology, IOTA was the daughter of the Titan Atlas and was the mother of the Hesperides. In Christianity, IOTA is sometimes used to represent the Trinity.