Sarira Traya, the Doctrine of the Three bodies , the human being is composed of three sariras or "bodies" emanating from Brahman by avidya, "ignorance" or "nescience".
https://en.wikipedia.org/wiki/Three_Bodies_Doctrine_(Vedanta)
They are often equated with the five koshas (sheaths), which cover the atman.
http://freeglobaluniversity.blogspot.com/search/label/Kosh
http://vedantaupanishad.blogspot.com/search/label/ChandogyaUpanishad
https://freeglobaluniversity.blogspot.com/search/label/Loka