Ābhūta-saṃplava & Loka-vibhāga
Dissolution Threshold and the Fourteen Abodes
व्याहारैस्त्रिभिरेतैस्तु ब्रह्मा लोकमकल्पयत् / ततो भूः पार्थिवो लोको ह्यन्तरिक्षं भूवः स्मृतम्
vyāhāraistribhiretaistu brahmā lokamakalpayat / tato bhūḥ pārthivo loko hyantarikṣaṃ bhūvaḥ smṛtam
By these three vyāhṛtis Brahmā fashioned the worlds. Thus ‘Bhūḥ’ became the earthly realm, and ‘Bhuvaḥ’ is remembered as the mid-space (antarikṣa).