Imperial/US length of 3 feet or 36 inches. In 1959 defined in terms of metric units as exactly 0.9144 meters. 1 international yard is exactly 0.9144 meters (SI base unit of length). 1 yd = 0.9144 m.
The distance covered by a single step assuming a stride length of 0.762 meters or 2.5 feet. Although stride length will vary by person and activity this may be useful in estimating distance traveled from the reading on a pedometer.