(usually childish) Feces; the act of defecation.
I need to go number two.
A first mate.
A primary assistant; vice-leader.
After she had shown great promise over the last 10 years, he made her his number two.
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.