Many constructed writing systems are purportedly used to write conlangs, but in reality are actually used to write English or another natlang.
For example, omniglot.com says that Kryptonian is "a transliteration alphabet containing symbols for each of the letters of the English alphabet. ... They just used this alphabet to write things in English in the comics."
Matoran has been called "similar to the English alphabet, being a simple substitution cipher".
And in Star Wars, Aurebesh is essentially the same, a different way of writing English, although technically it's actually "Galactic Basic". Apparently another script was also used to write Galatic Basic, called Outer Rim Basic, although there's very little information about it.
I'd consider these example to be a different kind of thing compared to something like the dancing men script from Sherlock Holmes as they're ostensibly constructed writing systems for other languages, whereas the dancing men script is explicitly another way of writing English.
In the conlang community, is there a specific term for this type of constructed writing system? Or should we just refer to them as "transliterations" or "substitutions"?
Please note that I am specifically asking if there is a term which excludes these categories:
- new orthographies for natlangs (ex. Canadian Aboriginal syllabics or Deseret for English)
- a new writing system actually used to write a conlang (ex. Tengwar for Quenya)