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As the title states. Stephenson uses (and describes the use of) the word "vitamin" to mean any goods that can be shipped to space. Is that actual space lingo?

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I believe Stephenson may have picked that up from the RepRap community in the open source 3D printing world. "RepRap is about making self-replicating machines."

At the present state, of course, there are many components that can't be reproduced (yet). The RepRap community calls these Vitamins. "In RepRap jargon, a vitamin (also called an imported part or non-printed part) is anything that you need to make a RepRap, which a RepRap cannot itself make."

This is very similar to the usage in SevenEves. They're shipping up components that can't be (or can't easily be) produced in orbit.

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    This is analogous to an actual vitamin, which is an amino acid that the human body needs but cannot make. – Acccumulation Jan 29 '18 at 19:13
  • @Acccumulation Vitamins are not amino acids. From Wikipedia: “The term vitamin does not include the three other groups of essential nutrients: minerals, essential fatty acids, and essential amino acids” (my emphasis). – Mike Scott Feb 27 '20 at 13:06

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