In general, key symbols refer to individual symbols or characters that are used to input information into computer systems, software applications, and other digital devices. Key symbols vary depending on the type of digital device or software being used, but they typically include letters, numbers, punctuation marks, and special characters such as @, #, and $. These symbols are accessed via a keyboard or touchpad and are used to enter text, commands, and other types of data into digital systems. In software applications and programming languages, key symbols can also refer to variables, arrays, and other programming constructs that are used to represent data and perform various operations. Overall, key symbols are an essential part of modern digital technology and play a crucial role in enabling efficient communication and data processing.