
There are three Synoptic Gospels and three epistles of John. The Magi – wise men who were astronomers/astrologers from Persia – gave Jesus three gifts. Saint Peterthrice denied Jesus and thrice affirmed his faith in Jesus. Jesus rose from the dead on the third day after his death. During the Agony in the Garden, Christ asked three times for the chalice to be taken from his lips. The ministry of Jesus lasted approximately three years. The threefold office of Christ is a Christian doctrine that Christ performs the functions of prophet, priest, and king. The Shield of the Trinity is a diagram of the Christian doctrine of the Trinity Christianity Hegel's dialectic of Thesis + Antithesis = Synthesis creates three-ness from two-ness. Peirce, and Karl Popper have made threefold divisions, or trichotomies, which have been important in their work. Philosophers such as Aquinas, Kant, Hegel, C. Three is the symbolic representation for Mu, Augustus Le Plongeon's and James Churchward's lost continent. The three doshas (weaknesses) and their antidotes are the basis of Ayurvedic medicine in India. In European alchemy, the three primes (Latin: tria prima) were salt (), sulfur () and mercury (). Humans being trichromatic, the retina contains three types of color receptor cells, or cones. The ability of the human eye to distinguish colors is based upon the varying sensitivity of different cells in the retina to light of different wavelengths. For this reason it is widely utilized in construction, engineering and design. The triangle, a polygon with three edges and three vertices, is the most stable physical shape.
Humans perceive the universe to have three spatialdimensions, but some theories, such as string theory, suggest there are more. Three is the number of dimensions that humans can perceive.Three is the ASCII code of 'End of Text'.
The Roman numeral III stands for giant star in the Yerkes spectral classification scheme.