> For the complete documentation index, see [llms.txt](https://alchm.gitbook.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://alchm.gitbook.io/docs/astrology-and-alchemy/alchemy/entities.md).

# Entities

The word **entity** is derived from the Latin *entitas*, which in turn derives from the Latin *ens* meaning "being" or "existing". For this reason, **entity** may literally be taken to mean "anything which exists".

**Entity** may refer to living beings, [planetary bodies](/docs/astrology-and-alchemy/planets.md), or any other complex system of [particles](https://en.wikipedia.org/wiki/Particle).