< 1 >
4 (four)
The number 4 has some interesting details. But any number is unique, and therefore you can come up with a lot of baloney for any number.
Composite number
The number 4 is the smallest composite number. You can divide it not only by 4 and 1, but also by 2.
Human body
Every person has 4 limbs, two arms and two legs. Animals often have four legs. Tables and chairs usually have four legs.
Dimensions
After length, width and height, time is often considered the fourth dimension. This plays a role in the general theory of relativity, where spacetime is used.
Analog clocks
On analog clocks, the hours are usually indicated with roman numerals. The number Ⅳ is almost always shown as ⅡⅡ.
Roman
Tetractys
For the ancient Greeks, the tetractys (tetra = four) was the symbol of completion. With ten dots, you can draw this as a triangle.
• • • • • • • • • •
You can calculate it as 1 + 2 + 3 + 4 = 10.