Jargon

Related:
* Hard sci-fi - expects the jargon to be factually accurate.

Usually this is terminology pertinent to a specific profession, commonly engineering but can be medical or anything else, even something more "mundane".

There's three variations of jargon used in fiction:
* Humorous — usually quite obviously made-up and exists for laughs. Commonly referred to as technobabble.
* Serious — made-up but sounds reasonable/real to anyone who doesn't know better. In some instances may be hard to prove as fictitious if used jargon involves currently unproven (but not disproven) theories.
* Factual — the real jargon that's used appropriately.