From the Wikipedia page 
Also on the other Voynich wiki  - text should be developed in parallel.
False writing systems are artificially constructed alphabets or scripts used (sometimes within the context of a false document) to convey a degree of concealed verisimilitude. Examples of this include alien dialogue in comic strips and graphic novels (such as Alan Moore's The League of Extraordinary Gentlemen , and the Valérian and Laureline series ). The script in Luigi Serafini's 1981 Codex Seraphinianus may be a false writing system; so perhaps may be the text of the Voynich Manuscript.