A perch is a unit of length that was historically used in some English-speaking countries, primarily in the United Kingdom. It is equivalent to 5.5 yards or 16.5 feet (about 5.0292 meters). The term "perch" is relatively old and is not commonly used in modern measurements.
Perches were often used in land measurement, particularly in agriculture and real estate. They were also sometimes used in surveying. However, the use of the perch as a standard unit of measurement has largely been replaced by more modern and standardized systems such as the metric system or the imperial system based on feet and yards. As a result, the perch is considered an archaic or historical unit of measurement today.
A rod is a unit of length used in some systems of measurement, primarily in the United States and the United Kingdom. In the U.S. customary system, one rod is equal to 16.5 feet or 5.0292 meters. It is also equivalent to 1/4 of a chain, which is another traditional unit of length.
Rods were historically used for land measurement, particularly in surveying and real estate. In some cases, you may still come across the use of rods in property descriptions, especially in rural or agricultural areas. However, the use of the rod as a standard unit of measurement has become less common in favor of more standardized systems like the metric system or the U.S. customary system based on feet and yards.