The belief that the way you hold a coffee cup can reveal your personality is often associated with the concept of "coffee cup reading" or "tasseography," which is a form of divination where patterns formed by coffee grounds settled in a cup are interpreted to gain insights into a person's life or future. This practice is not based on scientific evidence but is rooted in cultural traditions and superstitions.
In the context of tasseography, it's believed that the position of the coffee cup handle and the pattern of coffee grounds left on the inner surface of the cup can be interpreted to reveal information about the person's character, experiences, and potential future events.