5/Historical Note

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Historical Note on $5$

The number $5$ was the number associated by the Pythagoreans with marriage, the sum of $2$, the first female number, and $3$, the first male number.

According to Plutarch, the Pythagoreans also associated $5$ with nature, on account of its automorphic property.

The number $5$ is expressed in Roman numerals as $\mathrm V$.

It has been suggested that this originates from the shape of one hand held up showing the full $5$ fingers.