[akira2501]

> This brings back memories of the time I almost shortened "thousand kilometres" to "kkm".

SI is such a senseless system. Unit prefixes were not a good idea. Did you move the decimal point or just switch to "Mm?"

[ben_w]

In that specific case, I chose megameters.

[sneak]

At which point even metric-users who think in km are confused.

Certain things are measured in certain units, prefix included.

This would be like writing interstellar distances in km instead of light years or parsecs.