Actually, about 3 countries use non-standard measurements - the SI is the international standard.
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The French use the metric system; in fact they were the ones who created it! So it would still be 3 millimeters. The only countries to not use the metric system are the United States, Myanmar, and Liberia.
Standard index cards are approximately 3 inches by 5 inches in the United States. What is standard in the United States is not standard in other countries.
There is centimeters, inches, feet, meters & miles.
In those countries that use the long scale (based on powers of a million) like Europe:25 trillion = 25 x (106)3= 25 x 1018= 25,000,000,000,000,000,000In those countries that use the short scale (based on powers of a thousand plus one) like USA:25 trillion = 25 x (103)3+1= 25 x 1012= 25,000,000,000,000
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.