What is "pasigraphy"

Pasigraphy \Pa*sig"ra*phy\, n. [Gr. ? 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.
--Good.

n. (context linguistics English) A writing system where concepts are written instead of words. The system is not phonetic and uses ideograms, such as mathematical symbols. It is intended to be universally understood.

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; Leopold Einstein reviews 60 attempts at creating an international auxiliary language, the majority of the 17th-18th century projects being pasigraphies of one kind or another, and several pasigraphies and auxiliary languages, including some sample texts, are also reviewed in Arika Okrent's book on constructed languages. Leibniz wrote about the Alphabet of human thought and Alexander von Humboldt corresponded with Peter Stephen Du Ponceau (1760-1844) who proposed a universal phonetic alphabet.

Examples of pasigraphies include Blissymbols and Real Character.