The term 'I as in Ilium' is a reference to the Greek letter IOTA, which is the fourth letter of the Greek alphabet. It is often used to represent the number 10 in mathematics and is also used in various scientific and technical fields. In classical Greek, it was pronounced like an English 'ee' sound. In modern Greek, it is pronounced like an English 'i' sound. The letter IOTA is also used in many languages, including Latin, Hebrew, and Arabic.