Zeroth

In my opinion, the fact that we can't easily send the zeroth one should be a reason for us not to try to send and sell the second one.

This is the zeroth law.

Any real number other than zero raised to the zeroth power produces one.

The zeroth law of thermodynamics states that when two objects are separately in thermodynamic equilibrium with a third object, they are in equilibrium with each other.

The zeroth order polynomial approximation is constant.

A and C are in equilibrium following the Zeroth Law of Thermodynamics.