辐射 fúshè radiation
How to remember 辐射: 辐 ray + 射 to shoot = radiation.
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How it is used
- Radiation - and, figuratively, radiating outward influence - 手机辐射 (shǒujī fúshè) phone radiation; 太阳辐射 solar radiation.
- Very common in the extended sense: 辐射周边地区 (fúshè zhōubiān dìqū) to extend influence to surrounding areas (a hub's reach).
- Physics term plus a business/geography metaphor for spreading out from a center - think a hub "radiating" to satellites.