In the field of mathematics, the term "rule of thumb" is commonly used to refer to a general principle or heuristic. Historically, where did the term originate?
- It referred to a method of measuring angles using the width of the thumb.
- It described an empirical method used by ancient mathematicians for solving equations.
- It was based on the practice of using the thumb as a rough unit of measurement in carpentry and craftsmanship.
- It denoted a mnemonic device used by mathematicians to remember complex formulas.