It means that certain words we use have a meaning behind them, such as the word pain. It is not the pain itself we are thinking of, but rather it's the feel of pain which bothers us. A problem with this theory is when it is applied to an individual's self. A person can sit and read a book. Therefore sometimes behavior, such as in this example is not always thought out, but is automatic.
Factual identity is associated with identity theory.
The brain and mind are one, not two separate parts. To summarize this, brain events are not the same as mental events according to the nonidentity theorist. What we call the 'mental' is the round and orange picture inside of you. This means that mental terms lead us to events which are private and internal. According to this view, mind and body could not interact if they were radically different, but they are not radically different.