Generation Z, term used to describe Americans born during the late 1990s and early 2000s. Some sources give the specific year range of 1997–2012, although the years spanned are sometimes contested or debated because generations and their zeitgeists are difficult to delineate. Generation Z follows the millennial generation, sometimes called Generation Y, which followed Generation X, the first generation to be assigned a letter. Reaching the end of the standard Latin alphabet, Generation Z is succeeded by Generation Alpha, the first generation to be assigned a Greek letter.