Dream Sign

Inner Consciousness: a particular, abnormal thought, emotion or feeling.
Action: an abnormal, impossible action performed by characters, by me, or anyone else.
Form: Our form or another character's form is altered.
Place: the place or situation is strange.

A dream sign is a recurring element in our dreams.

It is important to know these elements when practicing lucid dreaming, so that we can recognize that we are in a Dream.