The above are further subdivided into 31 planes of existence.[web 4] Rebirths in some of the higher heavens, known as the Śuddhāvāsa Worlds or Pure Abodes, can be attained only by skilled Buddhist practitioners known as anāgāmis (non-returners). Rebirths in the Ārūpyadhātu (formless realms) can be attained by only those who can meditate on the arūpajhānas, the highest object of meditation.
Rebirth into the Śuddhāvāsa Worlds or Pure Abodes can only be attained by who? Rebirth into the formless realms can only be attained by who? How many planes of existence are there? What are the higher heavens called? What are skilled Buddhists called? What is another name for Ārūpyadhātu? What is the highest object of meditation called? How many planes of existence? Skilled buddhist practictioners that can get to the higher heavens are known as what? What is the highest object of meditation? What does arupyadhatu mean?