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5 (five)
The number 5 has some interesting details.
Prime number
Five is the only prime number that ends on a 5. From the number 5 on all prime numbers have the form 6n ± 1. This is how twin primes develop.
Pentagon
A pentagon is a regular polygon.
Dodecahedron
A dodecahedron is a platonic body and is the only one made up of regular pentagons.
Pentagram
A five-pointed star is called a pentagram.
Human body
At each hand you have 5 fingers and at each foot 5 toes. That's why we work with decimal numbers.
Office chair
An office chair has at least 5 wheels. This prevents it from tipping over to quickly.