The term 'not black or white' can be summarized by the word 'GRAY', which is a four letter word. GRAY is a neutral color that is often used to describe something that is not clearly one thing or another, but rather a combination of two or more things. It is often used to describe situations that are complex and difficult to define. GRAY is also used to describe a person's attitude or outlook on life, as it implies a lack of commitment to any particular point of view.