Plane

A plane is a parallel world or dimension. In Apocalypse, Not, Phoebe mentions that there are 11 planes of existence.

Physical Plane
The plane that we live in. This plane is the lowest which allows us to coexist with all of the planes.

The Heavens
A plane where the Elders live and keep the power of the gods. Here they watch over earth, witches and their whitelighters.

The Underworld
A plane where demons live.

Limbo
A plane where time stops, where death and aging can be avoided. Here, souls go to for reincarnation such as the zen masters, zodiacs and other magical beings.

The Astral Plane
A plane where time stops. Many demons have been banished to this plane like the Noxon Demons.

The Ghostly Plane
A plane where spirits pass through as a transition to the afterlife. There is no magic on this plane.

The Demonic Wasteland
A plane where all vanquished demons end up. This is also where the Beast lives.

The Parallel Plane
A plane where every being's opposite self lives (good is evil and evil is good).
 * e.g: Leo Wyatt being a whitelighter in the physical plane but a darklighter in the parallel plane, or Barbas being the "Demon of Fear" in the physical plane but the "Demon of Hope" in the parallel plane.

The Ancestral Plane
Simply referred to as "Afterlife".

The Spiritual Plane
A plane where all spirits live that can't or won't move on. Plasma balls only occur on this plane.

The Traveling Plane
A plane used for all sorts of Teleportation. It is refered to as the Neutral Plane in "Centennial Charmed".