I have multiple PIN numbers for different accounts.

The serial numbers on the products are unique.

Frobenius numbers are important in number theory.

The mesh numbers on the screen determine the size of the particles that can pass through.

She dialed the wrong numbers and couldn't reach anyone.

Many companies use 0800 numbers for customer service.

I have a list of phone numbers.

Algebraic numbers are a set of complex numbers that are solutions to polynomial equations with integer coefficients.

Hypercomplex numbers are a generalization of complex numbers.

The house numbers on this street are all odd.