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I should know this by ndtnguy

Like all organic, traditional units of measurement, the rod was derived from real things: the staffs used by surveyors. There were so many links in a chain, so many chains in a rod, so many rods in a furlong, etc.

I have attempted to memorize this particular conversion before and failed. Edit: and it appears I was even more wrong than I recalled, because chain is the larger measurement and rod the smaller.