# 2

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== 2 ==

**2** (two) is a number, numeral, and digit. It is the natural number following 1 and preceding 3.

### In Mathematics[edit | edit source]

In mathematics, 2 is the smallest and the first prime number, and the only even prime number. It is also the first Fermat prime, the first Mersenne prime exponent, the first Sophie Germain prime, the first safe prime, and the first Stern prime. The number 2 is also the base of the binary numeral system, which is the foundation of all modern computer systems.

### In Science[edit | edit source]

In science, the number 2 is significant in various fields:

- In chemistry, the atomic number of helium is 2.
- In physics, the diatomic molecules consist of two atoms.
- In biology, diploid organisms have two sets of chromosomes.

### In Technology[edit | edit source]

In technology, the number 2 is often used in binary code, which is the basis for all modern computing and digital electronics. The binary system uses only two digits, 0 and 1, to represent all possible numbers and data.

### In Culture[edit | edit source]

The number 2 has various cultural significances:

- In Chinese culture, the number 2 is considered lucky because it is believed that good things come in pairs.
- In Western culture, the number 2 often represents duality, such as good and evil, male and female, or life and death.

### In Religion[edit | edit source]

In many religions, the number 2 has symbolic meanings:

- In Christianity, the number 2 can represent the dual nature of Jesus Christ as both human and divine.
- In Hinduism, the number 2 can symbolize duality and balance, such as the balance between Shiva and Shakti.

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Contributors: Prab R. Tumpati, MD