With the release of Univers, Frutiger began using numbers rather than names to designate variations of weight, width, and slope. The full Univers family consists of twenty-one typefaces, and Frutiger has used this numerical system on other designs, including Serifa and Frutiger. Linotype also has adopted this numerical system for many other faces.
All twenty-one Univers faces were designed to work together, so they can be mixed in a variety of ways. Their legibility lends itself to a large variety of applications, from text and headlines to packaging and signage.