Sculpture of Vamana, an avatar of Vishnu, who is associated with the legend of taking three strides upon the three worlds Trailokya ( Sanskrit: त्रैलोक्य; Kannada: ತ್ರೈಲೋಕ್ಯ; Pali: tiloka, Tibetan: khams gsum; Chinese: 三界; Vietnamese: Tam Giới) literally means "three worlds"     It can also refer to "three spheres,"  "three planes of existence,"  "three realms"  and "three regions." 
Conceptions of three worlds (tri-
loka) appear in Hinduism and Jainism, as well as early Buddhist texts.
The Triloka Purusha, the figure who embodies the three worlds. Transcending the Three Realms 超出三界圖, 1615 Xingming guizhi
The concept of three worlds has a number of different interpretations in Hindu cosmology.
Traditionally, the three worlds refer to either the earth (
Bhuloka), heaven ( Svarga), and hell ( Naraka), or the earth (Bhuloka), heaven (Svarga), and the netherworld (  Patala)  The
Brahmanda Purana conceives them to be Bhūta (past), Bhavya (future), and Bhavat (present)  In
Vaishnavism, the three worlds are often described to be bhūr, bhuvaḥ, and svaḥ (the gross region, the subtle region, and the celestial region)  In the Nilanamatapurana, Vamana covers his second step on the three worlds of Maharloka, Janaloka, and Tapoloka, all of which are regarded to be a part of the seven heavens 
Buddhism, the three worlds refer to the following destinations for karmic rebirth:
Kāmaloka the world of desire, typified by base desires, populated by
hell beings, preta (hungry ghosts), animals, humans and lower demi-gods. Rūpaloka is the world of form, predominantly free of baser desires, populated by
dhyāna-dwelling gods, possible rebirth destination for those well practiced in dhyāna. Arūpaloka is the world of formlessness, a noncorporeal realm populated with four heavens, possible rebirth destination for practitioners of the four formlessness stages.