He is the Sadashiva, the teacher of the three tatvas - Atma tatva, Vidya tatva and Shiva tatva. He is Maheswara, the lord of the three Guna's - Satva, Rajas and Tamas. He is the father and lord of the three mandala's - Surya, Soma and Agni mandala. Tryambaka is the name of Lord Shiva as the father of the three worlds - bhu, bhuva and svarga lokas. Sukracharya said 'The first pada is 'Om Tryambakam Yajamahe'and means - we worship or sing the praise of Lord Trayambaka. In this case the shakti is Devi Amriteswari, addressed as 'hriim'. Shakti (the physical power of the mantra like the mother) - pada (feet).There are some opinion on this, but the most appropriate one is given by Kahola Rishi as 'haum'. Bija (the seed syllable that created the mantra and contains the mantra within itself, like the seed that creates the tree) - Liinga (sexual organ).In this case the devata is Lord Shiva addressed as 'Sri Mrityunjaya Tryambakeswara devata', the Jyotirlinga. Devata (the deity of the mantra) - hridaya (heart).It maybe noted that any change in the metre shall cause a distortion in the channdah and the mantra vibration shall be ruined. This is a meter having four pada (feet) of 8 phonemes each making the entire Anusthub metre as composed of 32 (8 x 4 = 32) syllables. This vedic mantra is in Anusthub channdah. Channdah (meter, which is technically very specific for each mantra) - mukha (mouth).

In this case the Rishi is Maharishi Vasistha. Rishi (Guru/teacher of the mantra) - siras (head).

Mrityunjaya mantra in bengali