Mrityunjaya Trayambaka Shiva

इच्छाज्ञानक्रियारूपा सा चैका शक्तिरुत्तमा।
तया प्रकुरुते नित्यं शक्तिमान् स शिवः स्मृतः॥ Netra Tantra : २२-१८॥

Notes:
Shiva is endowed with, or, is the Lord of the TriShaktis (Iccha, Gyana, Kriya)of which His 3 eyes are representative, hence He is also known as Trayambaka or Trinetradhari.
The 3 eyes also are considered to represent the 3 channels or the Sun-Moon-Fire (चन्द्रार्क वैश्वानर लोचनाय...).
The secrets of Mrityunjaya Sadhana lie in the understanding of these 3 eyes, and how the Energy (Kundalini) rising upwards converts the Water below to Fire above.
One needs to understand as to which 'yagya' one is inviting 'Trayambaka' (त्र्यंबकम् यजामहे...) in order to attain 'Moksha' from 'Mrityu' (मृत्योर्मुक्षीय माऽमृतात्..) and what is sacrificed in that yagya. Therein lies the secret of the Mrityunjaya Mantra.