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occult: Something that is hidden, e.g. secret or reserved knowledge.

orb: A type of anomaly that appears in photographs, especially digital flash photography, in which mysterious objects appear floating in the air.

omen: An event interpreted as a prediction of a future event.

oracle: A method of divination through contact with spirits or gods.

Order of the Knights Templar: A military and religious order founded in Jerusalem during the Crusades.

Ouija Board: A board containing letters and numbers, used to make contact with spirits.

out of body experience: AKA astral travel or astral projection, the experience of leaving one's physical body and possibly travelling to a distant place.