I've seen some obscure uses in technical areas, but in general use no they aren't used. Metric is better skipping all those and using the thousands prefixes. cm is used but mm is much better. Europe uses cl but we in Canada don't, we use ml.
this post was submitted on 15 Sep 2023
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I used to do land surveying in Canada and we'd use "decs" for decimetres when laying out points. You'd put down the rod, they'd tell you something like "dec and a half left" then you'd move closer and it'd be "two cents right" and you'd be even closer and then it's like "3 mils right." Then you'd take the shot and they'd tell you how much closer or farther you'd have to go to get the point. If you were way off to the point where you might have tens of metres, usually for rough layout we'd rarely use "dee-kays" for dekameters, but typically it would be just "30 metres north".
Is deca-yards (decayards?) a word? Centayards?
If not, should they be words?
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German with a scientific background. I can deduce the meaning of the words but I've never seen them used. I'm not even sure these units of measurement were mentioned when these were discussed. Most stuff is ton, kilogram, gram, miligram, microgram; kilometer, meter, centimeter, milimeter, micrometer. Rarely decimeter are thrown around.
Dekametre and hectometre, rarely. Mostly mm, cm, m, km.
In Europe, hg is relatively common, whereas in Canada, prices for deli products are "per 100 g" instead of per hg.
Also in Europe, cl and dl are common in recipes and bottles of alcohol, but in Canada, almost uniquely mL and L. (And yes, lowercase litre in Europe, but uppercase Litre in Canada, although that's gradually changing.)