|rule of thumb||
- A general guideline, rather than a strict rule; an approximate measure or means of reckoning based on experience or common knowledge.
- The usual says that to calculate when an investment will double, divide 72 by the interest rate.
Etymology: w:Michael Quinion, Michael Quinion lists the first documented use as 1692. apocryphally, Apocryphally, it has been claimed the term originally referred to the maximum thickness of a stick with which it was permissible for a man to beat his wife, but the earliest use in direct reference to domestic violence may be w:Del Martin, Del Martin"s 1976 book Battered Wives. Other suggested origins include the fact that the inch originated as the distance between the base of the thumbnail and the first joint, the practice of approximating the general direction of the wind by wetting the thumb then raising it in the air, and the rule of English Royal banquet plate setters using the distance of the thumb to equally space each plate from the table edge.
- Dutch: vuistregel
- French: règle empirique
- German: Faustregel
- Spanish: (t, es, regla general)
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