Shiva Purana
आराधनादिकैर्युक्तस्सिंहयोगासनादिकम् ॥ पद्मासनं वा विमलं तत्त्वत्रयसमन्वितम् ॥ ५ ॥
It may be a throne or a yogic seat or lotus-seat equipped with the three principles.
english translation
ArAdhanAdikairyuktassiMhayogAsanAdikam ॥ padmAsanaM vA vimalaM tattvatrayasamanvitam ॥ 5 ॥
hk transliteration by Sanscript