Morse Sound is a type of communication that uses a series of short and long signals, known as 'dits' and 'dahs', to represent letters and numbers. The term 'Morse Sound' comes from the name of Samuel Morse, who developed the code in the mid-1800s. The code is still used today in some forms of communication, such as amateur radio. The crossword solutions for the term 'Morse Sound' are 'DAH' (3 letters) and 'DIT' (3 letters). These terms refer to the two types of signals used in Morse Code, with 'DAH' representing a long signal and 'DIT' representing a short signal.