A straight edge,
or
a king or queen!
a ruler is called "Fürst"
A ruler is called 'une règle' (fem.) in French.
Called a straight edge
A egept ruler is called a Pharaoh
The ruler is called an Amir and the Amir today is Subah
If the ruler is a dictator, it is known as a dictatorship.
A number.
A country whose ruler has unlimited power is called an autocracy.
he was called the ruler
Because he rules People "rule" lines - Wikipedia
An unjust ruler might be called a tyrant.
a ruler is called 'une règle' (fem.) in French