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About these units
Yard (yd)
A yard equals 3 feet or 36 inches and serves as a mid-range imperial length unit. Historically, one definition of the yard was the distance from the tip of King Henry I's nose to his thumb when his arm was extended, though later attempts standardized the measure. Today, yards appear in sports (football, golf), textiles (fabric sales), and landscaping. In construction and engineering, the yard is sometimes used for larger distances where a foot would be too small a unit and a mile too large. Because it divides cleanly into both inches and feet, the yard plays a structural role in the imperial measurement system. It bridges the gap between human-scale and large-scale distances.
Mile (mi)
The mile, equal to 5,280 feet, is a legacy of a long history of measurement stretching back to Roman times. Its ancestor, the Roman "mille passus" (thousand paces), established a rough distance of 1,480 meters, which evolved through medieval and early modern Europe into various regional miles. The English statute mile was standardized in 1593 and survives today in the United States, the United Kingdom (for roadways), and a few other territories. Despite being a non-metric unit, the mile remains deeply embedded in cultural and infrastructural systems. Road networks in the US are laid out with mile markers; athletic events include the famed "one-mile run"; and many people intuitively judge driving distances in miles. Aviation and international travel sometimes reference statute miles, though nautical miles dominate in navigation. Its long history and familiarity keep the mile relevant even in a metric world.