They are units of measurement whose magnitudes are known to a few people rather than all. For example, if I said that someone was 10 cm shorter than me, the people who knew me would know what I meant but no one else would.
There are also examples - like the gallon - which can mean two different things, depending on which side of the Atlantic you are on.
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non standard units:dakotdalidamakdangkaldipagusihakbangkaingsakosaloptalampakantimuropiranggotsandamakbisigguhitkagitnagatangchimantakabansaloksaromangkokkisap matasaglitsandali
A non-standard unit of measurement is a way of reporting measurements in terms of units whose value only a few people may know. Many of the early, non-standard units of measurement, which were based on the human body, were like that. Everybody does not have the same span so saying that a table is 12 spans long is not particularly helpful. Some of these were ;ater standardised: palm = 3 inches, hand = 4 inches (10.16 cm) and so on.
Nine and a fifth - of any units, standard or not.Nine and a fifth - of any units, standard or not.Nine and a fifth - of any units, standard or not.Nine and a fifth - of any units, standard or not.
Probably that refers to expressing length in standard (metric) units, like meters, millimeters, and kilometers, instead of some non-standard (non-metric) unit like feet, or light-years.
Your living room. Your family and friends would know what that meant but nobody else would.