Matsya Purana — Uma’s Austerities and the Slaying of the Deceiver Asura ĀḌi
इति चिन्त्य हरस्तस्या अभिज्ञानं विधारयन् नापश्यद्वामपार्श्वे तु तदङ्गे पद्मलक्षणम् //
iti cintya harastasyā abhijñānaṃ vidhārayan nāpaśyadvāmapārśve tu tadaṅge padmalakṣaṇam //
Thinking thus, Hara (Śiva), holding in mind her identifying sign, looked—but on the left side of her body he did not see the lotus-mark that should have been there.
This verse does not address pralaya directly; it focuses on recognition through an auspicious identifying mark (padma-lakṣaṇa) within a narrative episode.
Indirectly, it reflects the Purāṇic emphasis on careful discernment and verification (abhijñāna) before accepting identity or claims—an ethical parallel to prudent judgment expected of rulers and householders.
The key technical element is iconographic: padma-lakṣaṇa (lotus mark) as an auspicious sign used for identification—relevant to Pratimā-lakṣaṇa (iconography) traditions rather than Vāstu construction rules.