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When talking about nails, a 10d nail for example, the d stands for ____.

A penny
The "d", which stands for the Roman coin denarius, is an abbreviation for penny and is used as the unit for measuring nail size. This comes from the days when nails were sold according to how many pennies they cost or how many nails you could buy for one penny. Today, it is still used, mostly as a measure of length, but nails are also labeled by their actual length, such as "$5984_w19_h38.png$ inch nails".
B nail head size
C inches
D pounds