What bracket is used to denote a number is excluded from a domain?

1. Jan 13, 2008

Mitchtwitchita

When asked to find the domain, what bracket is used to denote that a number is excluded or included in the domain, ( or [?

2. Jan 13, 2008

nicksauce

( or ) means excluded, [ or ] means included.
Example: For The Unit cirlce $$\theta \in [0,2\pi)$$

3. Jan 13, 2008

Mitchtwitchita

Thanks a bunch nicksauce!