The shekel in Biblical Hebrew is a unit of weight and currency that is smaller than both the talent and the mina. It was commonly used for trade and transactions and had different values depending on the historical era and location. In some contexts, it was equivalent to 20 gerahs.
A nanogram (ng) is a metric unit of mass in the International System of Units (SI). It represents one billionth of a gram or 10^-9 grams. The metric system is a decimal-based system of measurement used worldwide, and it provides a convenient way to express very small quantities of mass.
To put the size of a nanogram into perspective:
Nanograms are commonly used in various scientific and analytical fields where precise measurements of tiny quantities of substances or particles are necessary. Some examples of their usage include: