Dream Symbols ranging from Oa to Oe.

Oasis : may symbolise an aspect (such as a particular emotion) that has been lost in one’s life experience.

Obstacle, obstruction : 1. Symbolises obstructing hinderance. 2. Denotes a self-imposing/limiting belief.

Ocean : Large body of water often represents the subconscious mind. Its  condition will corresponds to its emotional state. For example, a turbulent sea will correspond with a  similarly turbulent emotional state.