Help me out here. I a lot of posts I see people using the term "NULL values". I my mind NULL is not a value, it's a mark for a missing value. So the correct term is NULL(s) or NULL mark. Now I see people write NULL values so often and even BOL uses that term. On the other hand if read a book about foundations of querying (by Microsoft) it clearly states that NULL should not be refered to as a value. Is it ever correct to refer to NULL as a value?
It's correct to refer to them as "NULL values" when that's the term by which your audience knows them. When I'm explaining to a company executive why his dashboard report isn't displaying properly, I'm not going to worry about how hardcore the term is, I'm going to describe it in a way the communicates the message, then help get his report fixed.