उमामहेश्वरव्रतं—पञ्चाक्षरमन्त्रस्य माहात्म्यं, न्यासः, जपविधिः, सदाचारः, विनियोगः
कृत्वाङ्गन्यासमेवं हि मुखानि परिकल्पयेत् पूर्वादि चोर्ध्वपर्यन्तं नकारादि यथाक्रमम्
kṛtvāṅganyāsamevaṃ hi mukhāni parikalpayet pūrvādi cordhvaparyantaṃ nakārādi yathākramam
Совершив таким образом анга-ньясу, следует затем ритуально представить божественные лики, начиная с восточного направления и продвигаясь до верхнего (зенита), распределяя их в должном порядке, начиная со слога «на» и далее по последовательности мантры.
Suta Goswami (narrating the Puja-vidhi to the sages of Naimisharanya)
It instructs that after aṅga-nyāsa, the worshipper should perform a structured visualization/assignment of Shiva’s directional faces, aligning the rite with mantra-order (nakārādi), thereby making the Linga-puja an ‘installed’ presence rather than a mere external offering.
Shiva is approached as Pati who pervades all directions and transcends them (reaching ‘ūrdhva’), and is accessed through mantra-śakti—His aspects are ritually ‘conceived’ so the bound soul (paśu) can orient mind and prāṇa toward the all-pervading Lord.
Aṅga-nyāsa followed by dik/ūrdhva-vinyāsa (directional arrangement of faces/aspects) keyed to a mantra-syllable sequence (nakārādi), a practice that supports Pashupata-style inner purification and focused worship.