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
A egept ruler is called a Pharaoh
The numbers are to the left of the inch markers.