In other words, it's complicated. Alan Cohen tells of a worker in a rail yard who went to work on a freezer car. He accidentally got locked in. Other workers found him the next morning, dead. You send a symbol which stands for an idea.
D stands for a certain sound, O stands for a certain sound, and G stands for a certain sound.
You also get a picture in your mind. Chances are that picture comes from your own experience, and your picture will be different from my picture because our experience is different. If we transmitted ideas, we would have identical pictures. We will never have identical experiences, though, because I send a symbol that represents my idea, and you relate that symbol to a similar idea you already have in your head. Think about the impossibility of telling someone who has been blind from birth about a rainbow.