comˈmand ˌmodule noun [countable]
the part of a space vehicle from which its activities are controlled

[TahlilGaran] Dictionary of Contemporary English ▲

command module
n., Space English
1. One of the three main sections of the basic Apollo spacecraft. It weighs six tons and is cone shaped. It contains crew compartments and from it the astronauts can operate the lunar module (LM), the docking systems, etc.
2. Informal transferred sense. The cockpit, the chief place where a person does his most important work.
My desk is my command module.

[TahlilGaran] English Idioms Dictionary ▲