Ruler

A ruler is an instrument used to make length measurements, whereby a length is read from a series of markings called "rules" along an edge of the device. Alternatively, it is called a rule, scale, line gauge, or metre/meter stick. Usually, the instrument is rigid and the edge itself is a straightedge, which additionally allows one to draw straighter lines.

Rulers are an important tool in geometry, geography and mathematics.
They have been used since at least 2650 BC.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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