The term CODE SOUND refers to the Morse code system, which is a method of transmitting text information as a series of on-off tones, lights, or clicks. The two crossword solutions DAH (3 letters) and DIT (3 letters) are the two components of Morse code. DAH stands for a longer sound or signal, while DIT stands for a shorter sound or signal. Together, these two sounds are used to represent letters, numbers, and symbols in the Morse code system.