What does a moon symbolize?

==new answer== In the universal language of mind, the moon represents awareness in subconscious mind. The subconscious mind stores our understood experiences and is responsible for re-creating from our thought forms which become our experiences. Stars are awareness in the conscious mind and the sun is awareness in superconscious mind, closest to the source.

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Also

In Paganism, the Moon represents the Goddess. The various stages of the Goddess represent the stages of the Moon.