The term 'Omega Predecessor' is a reference to the Greek letter 'Psi', which is the 23rd and last letter of the Greek alphabet. It is often used to symbolize the end of something, or the ultimate goal. In this case, it is used to refer to the predecessor of Omega, which is the 24th and last letter of the Greek alphabet. This predecessor is Psi, which is the 23rd letter of the Greek alphabet.