Shiva Purana
कर्णिकायां लिखेद्यंत्रं प्रणवार्थप्रकाशकम् ॥ अधः पीठं समालिख्य श्रीकण्ठं च तदूर्ध्वतः ॥ ९ ॥
In the ear one should write the instrument illuminating the meaning of the oṁkāra. Draw a seat below and a Śrīkantha above it.
english translation
karNikAyAM likhedyaMtraM praNavArthaprakAzakam ॥ adhaH pIThaM samAlikhya zrIkaNThaM ca tadUrdhvataH ॥ 9 ॥
hk transliteration by Sanscript