What is the opposite of the observer pattern?

Question

As I understand it, the observer pattern allows for multiple observers to monitor a single subject. Is there a pattern for the opposite scenario? Is there a pattern for a

Answer 1

Also consider related Mediator pattern.

Mediator pattern defines an object that encapsulates how a set of objects interact (Wikipedia)

More info here: http://sourcemaking.com/design_patterns/mediator

I also very like @CDC's answer on Mediator Vs Observer Object-Oriented Design Patterns:

The Observer pattern: Defines a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically.

The Mediator pattern: Define an object that encapsulates how a set of objects interact. Mediator promotes loose coupling by keeping objects from referring to each other explicitly, and it lets you vary their interaction independently.