According to Michener, DeLamater and Myers, a symbol is an arbitrary form that is used to refer to ideas, feelings, intentions or any other subject. It is arbitrary because there is nothing intrinsic in the symbol that inevitably links it to the subject it symbolizes.
There are several symbols that exist in our society that are understood by most people. When we wave, most people understand that this movement indicates a salutation (we are saying "hello"). Another example is raising a middle finger, which is considered obscene.
A symbol that I share with only one other person is a high-five in the air. I use this with my best friend, even if we are far away, when I want to show admiration or praise.
