Yard (yd)
The yard, abbreviated as yd, is a unit of length in both the imperial and US customary systems, equal to 3 feet or 0.9144 meters. Its origins lie in England, where its definition sometimes depended on the length of a king’s arm or the span of a stride. In the 20th century, the yard was formally standardized to ensure consistency in trade and science. Today, the yard is mainly used in the United States and the United Kingdom for measuring areas like sports fields, distances in games such as football and golf, and in the textile industry. Although metric units have become more widespread worldwide, the yard is still important in sports, construction, and some traditional applications.
Inch (in)
The inch, abbreviated as in, is a length unit in the imperial and US customary systems. Its history reaches back to ancient civilizations, including the Romans, Egyptians, and Anglo-Saxons. Originally, the inch was determined by the width of a human thumb, but it was eventually set as 1/12 of a foot. Since 1959, the inch has been officially defined as exactly 2.54 centimeters due to an international agreement. Inches are still widely used in the United States, Canada, and the UK, especially for construction, manufacturing, and personal measurements. Even with the global shift to metric units, the inch remains important in certain fields such as technical drawings, screen dimensions, and household tools.