देवदारुवनौकसां प्रति ब्रह्मोपदेशः—लिङ्गलक्षण-प्रतिष्ठा-विधिः, शिवमायारूपदर्शनं, स्तुतिः
वर्तुलं चतुरस्रं वा षडस्रं वा त्रिरस्रकम् समन्तान्निर्व्रणं शुभ्रं लक्षणैस्तत् सुलक्षितम्
vartulaṃ caturasraṃ vā ṣaḍasraṃ vā trirasrakam samantānnirvraṇaṃ śubhraṃ lakṣaṇaistat sulakṣitam
शिव-लिङ्ग गोल, चतुरस्र, षट्कोण या त्रिकोण हो सकता है; वह चारों ओर से निर्दोष, शुद्ध और उज्ज्वल हो। इन शुभ लक्षणों से युक्त लिङ्ग पूजन के लिए उत्तम कहा गया है।
Suta Goswami (narrating Linga-lakshana within the Purva-Bhaga discourse to the sages of Naimisharanya)
It gives core selection-criteria for a worship-worthy Shiva-Linga: acceptable canonical shapes and the requirement of being blemishless and pure, emphasizing ritual fitness and auspiciousness.
By allowing multiple geometrical forms while insisting on purity and flawlessness, it implies Shiva-tattva is not confined to one outward form; the paśu approaches the formless Pati through a sanctified, well-marked symbol.
It highlights puja-vidhi through linga-parīkṣā (examining the Linga’s marks): choosing a clean, unblemished form as the foundation for disciplined worship that supports Pāśupata-oriented purification.