According to Freud, refers to male genitalia. Jung considers three a mystical number; the three servants of the Queen of the Night in The Magic Flute; the three witches in Macbeth; the three wishes that are free. All this relates back, as do many god-trinities, to the original trinity: father-mother-son. It is the male child, since the number three, according to Western tradition, is uneven and, as a prime number, a genuine male number. In this tradition, the male child is seen first in terms of male fertility.
According to Jung, the number three is connected to the diabolical.
The den of craving in alchemy is depicted by a three-headed snake.
The three-headed snake in mythology is always Satan. Also, according to Jung, three belongs to the young; and in ancient China and the Greek patriarchy, it points to masculine attributes and their function.
On the other hand, Three as a feminine number is part of the tradition in the area of the Mediterranean, through the veneration of Mary in Catholicism and the rediscovery of the matriarchy. Also, Goethe’s play Faust, Part II, ends with a prayer to the great goddess appearing threefold: “Virgin, Mother, Queen.”... Little Giant Encyclopedia
The triune nature of humankind as body-mind-soul; and the triune nature of many divine figures (Father-Son-Holy Spirit; Maiden-Mother-Crone).
Stability 7 . Three legs gives the tripod or cauldron greater strength.
In ancient Greece, the number representing fate. External, powerful forces are at work here, whose source is wholly or partially unknown to you.
If the number appears on a die in the dream, this portends excellent luck (e.g., “three is a charm”).
Oracular experts claim any dream that repeats itself three times will come true.
Jung felt this number represented some type of incompleteness, like a table that’s missing one leg.... The Language of Dreams
The Three-person is creative and steadfast, loves partying, dancing, and being in love. Three-ness produces all things.
In general, Three always points to something new that is created from things that have already existed. Negatives and positives can be united—in the external as well as in your personality. It could possibly indicate a desire to have a child (two want to create something new), or might start a new business or a new project together with other people. See Jupiter.
Three-people have birthdays on the third, 12th, or the 30th day of a month.... Dreamers Dictionary
To dream of a three is not in itself significant but must be considered as a whole with the dream, whether or not is religious, etc., and then you will be able to tie it in to get a true reading.... Encyclopedia of Dreams