[nox_]

Isomorphism was already a word before Nodejitsu abused it. Your examples are acronyms and abbreviations.

Nevermind that this concept is not even worth a name.

[aboodman]

It is common to repurpose words this way. I think it is called 'metaphor'. See also: half the names in technology and all nearly every apple product name.

Anyway, I find the term useful.

[nox_]

Metaphors make sense, that reusing of isomorphism doesn't, however you quote Greek words to justify your means.