This is the denominator, which is the bottom line of the fraction.
In its simplified form, there is no such number.
denominator
The denominator
The denominator.
numerator
the fraction name is 9/17 or nine over seventeenths.
12 parts are in a fraction bar
2 parts in a fraction = numerator and denominator
2 parts of fraction = the numerator and the denominator
If the fraction has been simplified then there is no such number and so it cannot have a name.
The shaded parts