It could be called a straight edge.
It is often called a straight-edge.
Stright edge
Numbers written without exponents are called Standard Form.
a ruler is called "Fürst"
Whole numbers without decimals or fractions are called integers.
A ruler is called 'une règle' (fem.) in French.
Called a straight edge
Whole numbers which are called integers
2.5cm
by the numbers that are marked there
When there is only one ruler, it is typically referred to as a monarchy if the ruler is a king or queen, or as a dictatorship if the ruler has absolute power without constitutional limitations. In both cases, the authority is centralized in a single individual, who often has significant control over the state and its governance.
A egept ruler is called a Pharaoh