The term 'THIRD OF A TRIAD' is a four-letter phrase that can be used to describe the third member of a group of three. This phrase is often used to refer to the third person in a trinity, such as the Holy Trinity in Christianity, which consists of God the Father, Jesus Christ, and the Holy Spirit. It can also be used to refer to the third part of a triad, such as the three Fates in Greek mythology, or the three Graces in Roman mythology.