What is matter called that does not emit electromagnetic radiation?

The term for matter that does not emit electromagnetic radiation is dark matter. Dark matter does not interact with the electromagnetic force, which means it neither emits nor absorbs light or other forms of electromagnetic radiation. This is why it is termed "dark"; it is invisible to current forms of detection that rely on light. The presence of dark matter is inferred from its gravitational effects, such as the way it influences the motion of galaxies and the structure of the universe, rather than through direct observation.

In contrast, visible matter refers to the type of matter that can be seen and emits electromagnetic radiation, particularly in the form of visible light. Gravitational matter is not a standard term used in scientific discourse and does not specifically define a category of matter. Electromagnetic matter is also not recognized as a valid category in physics, as all matter interacts with electromagnetic forces in some capacity. This solidifies dark matter as the accurate choice in this context.