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.
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standard or imperial measurements are in : inches, feet, yards, pounds, gallons and asuming by nonstandard you mean metric measurements, they are in, millimeters, meters, kilometers, kilograms, liters. .........TADA!
You can invent any number of nonstandard units, but none of them is "best". It is best to use standard units, that is, the meter.
They are all measurements of some characteristic.
(used in units of measurement) denoting a factor of 10^−12
The standard unit of length is the meter, and any multiple and submultiple such as kilometer and millimeter. Nonstandard units include foot, inch, mile, light-year, parsec, astronomical unit.