The cooler speed unit
The cooler speed unit

2 crossposts
The cooler speed unit

You're viewing a single thread.
Why not just go with the universal and unitless proportion of "c"?
Or, for your slowpokes, parts per million or billion of "c".
Or, for your slowpokes, parts per million or billion of “c”.
cc, or centiC
What about μc or nc, a bit umder 300m/s & 3m/s, respectively.
Microlights and nanolights. Love it.
I just use % personally
How fast you are going as percent of c
That's a lot of leading zeroes. Or you have a really awesome motorcycle with rocket engines.
It's just easiest, it's capped at c and 0 so all meters just need to go to 100.. If you don't want exact measurements you can always normalize the value
‰ per mille (thousand).