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3

3 (three) is a number, numeral, and digit. It is the natural number following 2 and preceding 4.

Mathematics

In mathematics, the number 3 is a prime number, a Fermat prime, a Mersenne prime, and a lucky prime. It is the first odd prime number and the second smallest prime number. The number 3 is also the first number that forms a geometric progression (1, 3, 9, 27, ...).

In Roman numerals, 3 is represented as III. In the binary numeral system, it is written as 11. In the decimal system, it is simply 3.

Science

In science, the number 3 is significant in various fields:

• In chemistry, the atomic number of lithium is 3.
• In physics, there are three dimensions of space: length, width, and height.
• In biology, the DNA codon consists of three nucleotides.

Religion and Mythology

The number 3 holds significant meaning in various religions and mythologies:

• In Christianity, the Holy Trinity consists of the Father, the Son, and the Holy Spirit.
• In Hinduism, the Trimurti represents the three principal deities: Brahma, Vishnu, and Shiva.
• In Greek mythology, there are three Fates and three Graces.

Culture

The number 3 is often considered a lucky number in many cultures. It is frequently used in literature, art, and music:

• In literature, the rule of three is a writing principle that suggests that a trio of events or characters is more humorous, satisfying, or effective.
• In art, the rule of thirds is a guideline for composing visual images.
• In music, a triad is a set of three notes that can be stacked vertically in thirds.

Related Pages

• Number
• Prime number
• Roman numerals
• Binary numeral system
• Decimal
• Atomic number
• Dimensions
• DNA
• Holy Trinity
• Trimurti
• Greek mythology
• Rule of three (writing)
• Rule of thirds
• Triad (music)