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Originally Posted by Wikipedia
Real materials emit energy at a fraction—called the emissivity—of black-body energy levels. By definition, a black body in thermal equilibrium has an emissivity of ε = 1.0. A source with lower emissivity independent of frequency often is referred to as a gray body.[4][5] Construction of black bodies with emissivity as close to one as possible remains a topic of current interest.[6] A white body is one with a "rough surface [that] reflects all incident rays completely and uniformly in all directions."[7]
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I will think of it as a grey body is a black body that's been left out in the weather.
