Pasigraphy

From Langmaker

pasigraphy n. [Greek for all (dat. pl. of all) + -graphy.] A system of universal writing, or a manner of writing that may be understood and used by all nations.

The only true pasigraphy today is the system of Arabic numerals, which are used across hundreds of languages. The most famous pasigraphy is probably Leibniz's Characteristica Universalis. Pasigraphies are a form of philosophical language, where the neography is the language.