Hermeticism, often known as Hermetism, refers to a philosophical ideology based mainly on the reputed teachings of Hermes Trismegistus. It comprises the legendary Hellenistic combination of the Greek God Hermes and the Egyptian God Thoth.
These teachings can be found in the various texts assigned to Hermes (the Hermetica). These scripts were written over a longer period (c. 300 BCE – 1200 CE) and may differ materially in both content and depth.
One of the most prominent contexts of the term refers to a particular subsection of Hermetic texts regarded as the 'philosophical' Hermetica. The most noteworthy sub-group is the Corpus Hermeticum (an assemblage of seventeen Greek Hermetic treatises recorded between c. 100 and c. 300 CE).