What is the meaning of Number_two?

White, Caucasian.

Feces; the act of defecation.

A first mate.

A primary assistant; vice-leader.

The batsman who opens alongside the number one, but does not face the first delivery.

A somewhat small town, between a number one and a number three, where the success of a theatrical performance is unlikely to be very great.

A pencil with hardness level 2.

mistress (the other woman in an extramarital relationship, generally including sexual relations)

Source: wiktionary.org