dactyliomancy: Any of a variety of methods of divination using rings; for example, by using a ring as a pendulum or dropping it into a glass of water.

daemon: AKA daimon, dæmon. In Greek mythology, a being who is part mortal and part god. May be benevolent or malevolent. The Greek spellings are used in modern times to distinguish Greek daemons from Jewish and Christian demons.

daylight discs:One of the six Hynek categories of Unidentified Flying Objects (UFOs), defined as an anomalous object seen in the distant daytime sky.

death chart: A figure in astrology constructed to show the date and/or time of death.

death panorama: An out-of-body experience for the newly-deceased, in which the person's life is shown to them as a panoramic view. This experience is said to last for two to three days.

death prayer (1): A prayer said by the living for the dead, to help the deceased in the afterlife or to ask for help for the living.

death prayer (2): A technique used to cause the death of a person, for example, commanding a demon to murder.

Dee, John: (1527 - 1608) British mathematician and astrologer, adviser to Queen Elizabeth I.

Déjà vu: An unexpected sense of familiarity when encountering what you believe is actually a new experience, place, person, or object.

demon: An evil spirit in traditional Jewish and Christian belief.

demonic sins: A description of the seven deadly sins, with the belief that each is controlled by one of seven demons: Lucifer (pride), Mammon (avarice), Asmodeus (lechery), Satan (anger), Beelzebub (gluttony), Leviathan (envy), Belphegor (sloth).

demonomancy: Divination with the assistance of demons.

deva: In Buddhism and Hinduism, a higher-level being or minor god.

Devil: Another name for the biblical Satan, the fallen angel who tests man's relationship with God. The Devil is often taken to mean the embodiment of all evil.

Devil's mark: A birthmark or other blemish on a person, said to have been placed there by the Devil as a sign of ownership.

Devil's Triangle: A synonym for the Bermuda Triangle. Sometimes used to refer to the Dragon's Triangle in the Pacific Ocean.

divination: The supernatural art of prophesy; foretelling the future.

double: An exact duplicate of a person, usually an apparition located at a distance from the original.

dowsing: A technique which employs a forked stick, bent wire or pendulum to locate things. The most common applications are searching for water, oil, etc.

Dracula: The name of a vampire in the Bram Stoker novel of the same name (published 1897).

Druid: Member of the pre-Christian Celtic priesthood of Britain and Gaul. Literally means "knowing the oak tree", the oak being sacred to the ancient Celts.

Doppelgänger: In German folklore, a wraith or apparition of a living person; a "spirit double" or exact replica of a person.

Dragon: A mythical creature generally represented (in western society) as a huge, winged, sometimes fire-breathing reptile with crested head, a long tail, and enormous claws and teeth.

Dragon's Triangle: AKA Devil's Sea, one of 12 Vile Vortices originally plotted by Ivan T. Sanderson.

DuBois, Allison (1972-): American celebrity psychic.

Duncan, Helen (1897–1956): Scottish medium; the last person to be convicted under the British Witchcraft Act.