The letters at the end of the alphabet usually represent variables while the letters at the beginning of the alphabet usually represent constants. As you get into more and more difficult mathematics, those are not sufficient. Then you need to start using Greek, then Hebrew, then Old German, and finally Russian.
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The symbols used are called variables.
Variables. If you're talking about math.....
slope can be represented by any variables, such that, the variable representing the slope is defined. by convention, mathematicians and mathematics books authors used and are using "m" as the variable for slope. (recommended to have further historical research on this matter)
It is the first letter of the Greek alphabet which can be used, in geometry or algebra, to represent angles. In probability it can be used to represent a Type I error.
Control Condition