Air
In medieval cosmology, air lay between water and fire as the second highest element.
In the western system, Air overcomes Water, and is opposed by Earth.Associated with the humour of Blood. It symbolises courage and hope, as well as the way that these can drive a person to hubris and overconfidence when taken to excess.
In western Astrology, Air governs the houses of Gemini, Libra and Aquarius.
In the Hindu Chakra system, Air is associated with the Heart.