[qntm]

> Vehicles using this interface may include light vehicles in the range of 5-8K kg, and medium vehicles in the range of 8-25K kg. These vehicles will dock to each other, to large space complexes in the range of 100-375K kg, and to large earth departure stages in the range of 33-170K kg.

I've never seen "K kg" stand for metric tonnes before. Two Ks of different cases both standing for "kilo-" therefore meaning "kilokilogram"? At first I thought "five kilograms is quite small for a spaceship" and then I had to re-read it. To say nothing of the fact that "K" means Kelvin, not kilo-.

On the other hand, what are the other options? "Mg" for "megagram"?

[Someone]

There are (several) guidelines that abolish certain abbreviations because misinterpretation can kill, for example http://www.ismp.org/Tools/errorproneabbreviations.pdf

I cannot find a guideline w.r.t. Mg, but it can easily be confused with milligram and microgram. That may be the reason to use this weird construct ('ton' seems a better term, but it is ambiguous, too)

[qntm]

"Ton" would be ambiguous, but "tonne" is unambiguously the metric tonne (1000 kilograms).

[lostlogin]

Good spotting, I assumed a typo and skimmed on. I was imagining some kind of unknown-to-me efficiency in super light space ships..