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The other day I had a Certifier list a course as 100M, which he insisted it was 100 miles. First, you should always have a space after the number and a lower case letters for the unit of measure. He should have used 100 mi for 100 miles. Below are the standards we need to use on our certificates.

Abbreviations

km = kilometers

mi = miles

m = meters

ft = feet

cm = centimeters

in = inches

yd = yards
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Gene,

The abbreviations you provided make the units more clear. These are the abbreviations I have been using for several years.

```ABBREVIATION	UNIT OF MEASUREMENT
C               Celsius, Centigrade
cm              centimeter
F., F           Fahrenheit
ft.             foot
in.             inch
K               Kelvin
km              kilometer
m               meter
mi.             mile
mm              millimeter
n.m.            nautical miles
yd.             yard```

Thank you. -- Justin

References:
Last edited by justinkuo
Here we thought all those races (5K 10K etc) were referring to distance but they are really named for very cold temperatures!
Bob,

The 5 Kelvin race is held annually on Neptune. I for one don't care what abbreviations Neptunians use.
Thanks for that info, Lyman. It seems that a year on Neptune is worth about 165 of our years-- I think that means it's been about a Neptune year since earthlings discovered Neptune's existence in 1846!
To go back briefly to Gene's original concern, I think this refers to how we list distances on certificates-- but I did take the liberty of advising one of my measurers that "_____ 5 km" would be preferable to "_____ 5km" (as name of course on map). Maybe that is a little hypocritical because we're unlikely to convince race sponsors and organizers to stop using "5K" etc. Any thoughts?
A 5 km is probably best. However when I see 5k that works for me. I have a real problem when one states a 5 km is 3.1 miles or a half is 13.1 miles. Please don't comment on these ideas as they are a different topic.

If one wants to start a topic on the above, please do so.

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