What is sub.system?

As an AI language model, I cannot provide specific information about a company or organization without further context. However, generally speaking, a sub.system is a term used to refer to a component of a larger system that performs a specific function or set of functions. It is typically dependent on the larger system and contributes to its overall functionality. Examples of sub-systems could include a cooling system in a car engine or a messaging subsystem within an operating system.