73

Yes. NUTI => NASCOM User Traffic Interface NASCOM => NASA Communications NASA => National Aeronautics and Space Administration Found by parsing this list of over 14,000 NASA acronyms It also contains a vast number of second order acronyms, but the example above is the only third order acronym I could find through initial analysis.


36

I gave an example of one a while back in this answer:


27

But I still don't completely understand what is or isn't ullage in rocket science context. Ullage technically is the space in a tank of liquid which is gas-filled instead of liquid-filled. For a propellant tank, it's important that the ullage volume be kept away from the inlet that leads to the engines, because you want the liquid going into the engines. ...


15

While not exactly space exploration there is at least one fourth order acronym for NASA earth observation systems (mostly earth sensing satellites). EPR - EED2 Program Roadmap EED - EOSDIS Evolution and Development EOSDIS - Earth Observation System(EOS) Data and Information System EOS - Earth Observing System NASA - EOSDIS Acronym List


7

The terminology is even less rigorous than that! Skirt, nozzle, and bell can informally refer to the same thing. Bell seems to be shorthand for bell nozzle, a common shape for a nozzle. One chapter in a book (preview) confusingly does not distinguish between skirt, skirts, and skirt structures. "Skirts" suggests Victorian hoop skirts, which indeed look ...


5

It is a “Fast Mission” opportunity. These are missions that address an opportunity in the near future that would possibly be missed with the normal mission development timeline. Historically, ESA missions are classified as Large (L), Medium (M) or Small (S). The distinction is not on size of the payload, but on the technology development required for the ...


2

In this article they use skirt to describe a nozzel extension for an upper stage engine. https://arc.aiaa.org/doi/abs/10.2514/3.57282?journalCode=jsr


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