Pasigraphy

A pasigraphy (from Greek pasi 'to all' and graph 'write') is a writing system where each written symbol represents a concept (rather than a word or sound or series of sounds in a spoken language). The aim (as with ordinary numerals 1, 2, 3, etc.) is to be intelligible to persons of all languages. The term was first applied to a system proposed in 1796, though a number of pasigraphies had been devised prior to that.
Examples of pasigraphies include Blissymbols and Real Character.
More information on the Wikipedia page . Some more information here
Given the length and nature of the Voynich Manuscript pasigraphy is probably not applicable for the most part.
Category:Writing systems