Hegyi no relation writing system
Digraphia: "Two types of written form of one language co-exist, based upon the usage of two distinct graphical systems (scripts) by the respective language community."
Diorthographia: "Two types of written form of a particular language co-exist, using the same script, but they are based upon the usage of two distinct orthographies by the same language community."Usage of "diorthographia" is unusual. Compare dysgraphia meaning "a language disorder that affects a person's ability to write" and dysorthographia "a synonym for dyslexia".
The anthropologist James R. Jaquith (1976), who studied unconventional spelling in advertising, used "digraphia" to describe the practice of writing brand names in all caps (e.g., ARRID). He described digraphia as "the graphic analog of what linguists call diglossia", and defined it as "different versions of a written language exist simultaneously and in complementary distribution in a speech community."The sociolinguist Ian R. H. Dale (1980) wrote a general survey of digraphia, defined as, "the use of two (or more) writing systems to represent varieties of a single language."The sinologist and lexicographer John DeFrancis (1984) used digraphia, defined as "the use of two or more different systems of writing the same language," to translate Chinese shuangwenzhi (雙文制 "two-script system") of writing in Chinese characters and Pinyin.  DeFrancis later explained, "I have been incorrectly credited with coining the term digraphia, which I indeed thought I had created as a parallel in writing to Charles Ferguson's diglossia in speech."Hegyi coined and suggested the terms "bigraphism" and "multigraphism", but he only used them twice (p. 265; fn. 17, p. 268) and did not promote the use of either of these terms, nor follow up on his insights into the importance of studying "the use of two or more different writing systems for the same language... such cases have been more widespread than commonly assumed."
no relation