Grey (or gray in American English) is an intermediate color between black and white.
The term "grey" can also refer to:
1. A dull or uninteresting condition - "a grey existence"
2. An area that is not clearly defined - "the grey area between right and wrong"
3. In business, "grey market" refers to unofficial trading channels
4. In nature, grey animals like grey wolves or grey whales
5. In literature, "grey characters" are morally ambiguous