Common meaning:

A short word that is substituted for the proper name of a person.

Hidden meaning of the Equity religion: 

Used to promote an Equity world of false reality.

Discussion:

Equity teaches that there are many different genders and encourages people to use their unique personal pronouns as a way to promote this reality.

In the real world, it is a biological fact that there are only two genders and that fact does not change, no matter how many pretend ones you make up. The multiplicity gender world will fail no matter how desperately the Equityists try to make their illusion real.

When Equity followers add their personal pronouns to email signatures, it is an act of worship to their god of Equity and a signal to others that they are Equity believers. Do your best to avoid worshiping false gods.

Support the real reality and reject the Equity illusion.