Radar Cross-section
The amount of electromagnetic energy an object reflects back to a radar transmitter, determining how easily radar can detect it.
A measure of how strongly an object reflects radar waves back toward their source. Expressed in square meters, it quantifies the effective area that scatters electromagnetic energy. Smaller values indicate stealth characteristics; larger values mean easier detection. Used in aviation, military, and weather applications.
What this means in real life
A large commercial airliner has a high radar cross-section and shows up clearly on airport radar screens from miles away, while a small drone has a much lower one and may be harder to spot.
What it isn’t
It is not the physical size of an object. A small, reflective object can have a larger radar cross-section than a much bigger object designed to absorb radar waves.
Commonly misused online
Often conflated with 'invisibility to radar'—people assume low radar cross-section means completely undetectable, when it actually just means harder to detect at distance or requires more sensitive equipment.