Kosha
A kosha (also kosa; Sanskrit कोश, IAST: kośa), usually rendered "sheath", is a covering of the Atman, or Self according to Vedantic philosophy. The five sheaths, summarised with the term Panchakosha, are described in the Taittiriya Upanishad (2.1-5), and they are often visualised as the layers of an onion.