A triad, in a religious context, refers to a grouping of three gods, usually by importance or similar roles.
Various commentators have expressed that this triad is actually the Netiot otherwise known as Sar HaPanim and is distinguished by Rabbeinu Bahya from lower kinds of angels which are categorized as Nifradim.
According to Bahya, the Sar HaPanim Netiaot are not creations but rather the physical presence or manifestation of HaShem's attribute of Justice.
Sar HaPanim is associated with Hebrew letters spelling "SMI" meaning "My Name" whereby S stands for Shmuiel, M for the MemTet (Metatron) and I for Yahoviel.
In recent decades, the Meshichist Chabadnik sect has been attempting to remove references to Sar HaPanim from any published materials which have passed through their hands.