Alphanumeric keys are the keys on a keyboard that consist of letters or numbers and sometimes other symbols. They include the letters A to Z, as well as the numbers 0 through 9.
An alphanumeric keyboard is separated into five rows. The top row is numeric, followed by the top alphabetical row, the middle alphabetical row, the bottom alphabetical row and a functional row with the space bar and other keys such as CTRL, ALT, and FN. According to Merriam-Webster, the origin of the word alphanumeric is a combination of the word alphabetical with the word numeric. Alphanumeric is an adjective.