Physical sound is a term used to describe any sound that can be heard by the human ear. It includes both natural and artificial sounds, such as those produced by musical instruments or machines. The three crossword solutions for the term physical sound are AAH (3 letters), AHH (3 letters), and HBEAT (5 letters). AAH and AHH are both vocalizations that are often used to express emotion, while HBEAT is an abbreviation for heartbeat, which is a sound produced by the human body.