Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 3 · Name Letters and Chakras
युद्धजयार्णवः (चक्राणि)
रक्षया नारसिंह्या च भैरव्या शक्तिरूपया ।सर्वे(र्वं)त्रैलोक्यमोहिन्या गौर्या देवासुरे रणे ॥ ३६ ॥
In the full Agni Purana this is chapter 133, verse 36.
In the war of the gods and the demons, the gods were guarded by this protection. It came through Narasimhi and Bhairavi in the form of Shakti. And through Gauri, who bewitches all three worlds.
Simple meaning: In the war of gods and demons, this spell guarded the gods through Narasimhi, Bhairavi and Gauri.
बीजसंपुटितं नाम कर्णिकायां दलेषु च ।
Put the name in the centre and on the petals, with seed syllables around it. This is the protection figure.
मृत्युंजयं प्रवक्ष्यामि नामसंस्कारमध्यगम् ।
Next comes the Mrityunjaya figure, with the name in the middle, awakened by the letter sa.
जकारं विन्दुसंयुक्तमोंकारेण समन्वितम् ।
Write ja with a dot and Om inside the letter dha, and awaken it with va.