The emerging Swiss design gained its alphabetical expression in several sans-serif type families designed in the 1950s. The geometric sans-serif styles, mathematically constructed with drafting instruments during the 1920s and 1930s, were rejected in favor of new designs inspired by nineteenth-century Akzidenz Grotesk fonts. One of the new typefaces designed during this period was , which was created as a palette of twenty-one visually related fonts. All twenty-one have the same x-height and baseline, and all ascenders and descenders are the same length. Numbers replaced conventional nomenclature.