EDIT The five is the natural number between 4 and 6.

It is also...
- the third largest smallest prime number
- a fermat prime, because it can be written as 2^(2^1)+1
- the first Wilson prime
- a Fibonacci number, because it is 2 plus 3. A Fibonacci number is made up of the sum of its two predecessors: 1, 2, 3, 5, 8, 13,...

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EDIT The five in various numbering systems
- In Roman numerals, five is V (it comes from a representation of an outstretched hand)
- In the Greek alphabet, five is ε (epsilon)
- In the Hebrew alphabet, five is ה (heh)
- In the Cyrillic alphabet, five is Е
- In binary code (base 2) five is 101
- In ternary code (base 3) five is 12
- In quaternary numeral system code five is 11
- In quinary five is 10; in senary code and all codes above (such as octal, decimal and hexadecimal) five is 5

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EDIT Biology
- humans have five extremities (head, two arms, two legs) and five fingers on the hands, five toes on the feet. Most mammals are built the same way, and almost all other species with fingers or toes have five of them, too.
- the five senses according to Aristotle are sight, smell, hearing, touch and taste. Today we also know a sixth sense, equilibrium.
- Starfish usually have five arms

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EDIT Culture
In Oriental tradition, there are five elements: water, fire, earth, wood and metal. Western tradition only knows four, but the pythagoreans accepted ether as the fifth one, today known to us as the quintessence.

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EDIT Religion
The Islam has five basic "pillars" (ritual duties):
shahada: testifying that 'There is no god but God and Mohammad is the Messenger of God' salat: prayer five times a day
zakat:giving alms
sawm: fasting during ramadan
hajj: pilgrimage to Mecca

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EDIT Music
- Five musicians are a quintet. There is a certain musical interval called a quint.
- Lenny Kravitz made an Album called "5"
- A famous jazz piece by Paul Desmond, most popular played by Dave Brubeck, is called "Take Five". It has five beats per bar.

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EDIT Various
- "to hang five" means surfing a longboard with the toes of one foot hanging over the nose of the board. There's also a "hang ten".
- the five stages of grief are shock, denial, anger, bargaining and acceptance
- a pentameter is a verse with five repeating feet per line; iambic pentameter was the most popular with works of Shakespeare
- five is the highest and most damaging number on the Saffir-Simpson Hurricane Scale
- the five olympc rings represent the five continents
- the word "punch" for the alcoholic beverage comes from the Hindi word for five and means "five ingredients"
- "to give five" means to slap hands in acceptance
- the protagonist of George Orwell's novel "1984" accepts at the of the story that 2+2 equals five

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