Word originates from the Latin "regulates". And this term has many meanings in Spanish, we mean by rule an instrument or utensil that can be made of metal, wood, plastic, among others, rectangular in shape, where one of its sides shows a graduated measure divided into centimeters that is commonly used for draw lines or measure the distance between two points and its length almost never exceed one meter.
Other of the most common meanings of rule is used to name the rule or precept that must be respected and fulfilled required by a competent jurisdiction or authority, and if said order is not fulfilled it will bring consequences and punishments; It is a set of rules that we live with daily, and that are imposed by a larger entity to be fulfilled by man, to have a pleasant balance in the world in which we live.
The rules can also be indications of how to practice, or how a particular game should be developed, we talk about sports, where each specific game has a series of rules, which the participants or players must comply with for the good practice of this; and if said parameters are not complied with, an arbitrator will have the duty to punish those who do not comply with them. On the other hand, said voice can refer to the steps that are followed to achieve building something.
Another use is the association with the period of each month where the woman loses blood through the vagina from the uterus, representing the beginning of the female sexual cycle, this is what we commonly call menstruation. In the mathematical world there is the rule of three, and this is a procedure used to do a mathematical operation. And finally in grammar there are a series of rules for the good writing of words.