It has already been mentioned by me that the three Vedic metres, Gāyatrī, Tṛṣṭup and Jagatī are the sources of origin of the Ambakas (i.e. Kapālas) along with the Vanaspati (i.e. the medicinal herbs). These three metres join together and assume unity (i.e. when they are used in Mantras at the time of the consecration of the Puroḍāśa offerings). That Puroḍāśa is infused with the virility of each of these mantras. Hence the Puroḍāśa is remembered as Trikapāla (having three vessels to hold it). Therefore the Puroḍāśa is Tryambaka as well. Hence the lord (to whom this Puroḍāśa is offered) is remembered as Tryambaka.