The terms are getting muddy at this point. Perhaps you are thinking of Vari-focal lenses which are zooms, but must be refocused as you zoom. You can set the lens at any focal length. These are different from lenses that are not zooms, but still have more than one focal length. Several were sold under the Soligor, and other labels, like a 28mm & 35mm lens, and 85mm & 135mm lens. The Tri-Elmar is like this.
Vari-focal lenses have benefits, and are known for their sharpness, wide-apertures, price, and other features -- if you don't mind re-focusing all the time.