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The yard (yd) is an imperial unit equal to 3 feet or 0.9144 meters, commonly used in the United States for measuring fabric, football fields, and medium-length distances. It provides a convenient middle ground between feet and miles for outdoor measurements. One yard equals exactly 0.9144 meters, which is close enough to a meter for quick estimates.

The millimeter (mm) is the smallest commonly used metric unit of length, equal to one-thousandth of a meter. It is widely used in engineering drawings, manufacturing tolerances, and rainfall measurements where precision matters. One millimeter equals roughly 0.0394 inches, making it ideal for describing thin materials like paper or wire.