Dekameter
A dekameter (dam) is a unit of length in the metric system, equal to 10 meters. It sits between a meter and a hectometer in size. Although it is an official part of the metric system, the dekameter is rarely used in everyday life, education, or even science. For example, a small swimming pool might be around 2 dekameters long. The symbol for dekameter is "dam". Since most people prefer using meters or kilometers, the dekameter is more of a theoretical unit used mainly for teaching the structure of the metric system.
Nail (Cloth)
A nail is a traditional unit of length used in cloth measurement, equal to 2¼ inches or approximately 5.715 centimeters. It was commonly used by tailors and fabric merchants in England to measure small lengths of fabric.
The term “nail” likely originates from the practice of marking lengths on a measuring stick with notches or nails, making it easy to measure fabric quickly. The nail was a convenient subdivision of the yard, with 1 yard = 16 nails.
Though obsolete today, the nail remains an interesting part of historical textile measurement systems.
Summary:
1 nail = 2¼ inches (5.715 cm)
1 yard = 16 nails
Used historically in tailoring and fabric trade
Originates from notches or nails on measuring sticks
No conversions available for length.