the.com/command module

means The cone-shaped compartment of a spacecraft where the astronauts ride, steer, and live — the only piece designed to survive re-entry and splash down on Earth.

from A straightforward compound: 'command,' from Latin commandare (to entrust, to order), because it housed the crew and the controls that ran the mission; and 'module,' from Latin modulus (a small measure), adopted by engineers for a self-contained detachable unit. The phrase itself is a 20th-century coinage from the Apollo-era space program, which needed plain, functional names for the pieces of a spacecraft built to be shed in stages — command module, service module, lunar module — each named for its job rather than for any poetry, though poetry found it anyway.