TASK DEFINITION: Generate the answer for a given question. The question requires common knowledge of English. Make sure that the answer is in detail, long, consistent with the context, and requires general knowledge of English. To be less repetitive, please vary your language for each question. Give a proper explanation to answer, and if necessary, provide the definition of various terms. And conclude your answer if it's long. If you have used other resources (e.g., Merriam Webster's.) to answer the question, include citations in your answer. You don't need to paraphrase the context of your resources, but make sure that your answer is consistent and complete.
PROBLEM: From Wikipedia: In the expression a b = c, a is called the dividend or numerator, b the divisor or denominator and the result c is called the quotient. What's most common (in the context of programming)? dividend/divisor numerator/denominator.

SOLUTION: Dividend and divisor are terms commonly associated with long division while numerator and denominator are the preferred terms when working with fractions. Operators, operands, parameters, and arguments are usually the terms employed in programming. If any of the OP's listed terms are at all utilised, it will very likely be numerator and denominator (in their mathematical sense).

PROBLEM: Variation lock seems more accurate by mathematical definitions Edit(to give it more context) Hey, can you tell me the combination of your lockbox ? Why don't we say variation(or permutation)? The order matters in this case and combination is an unordered set of numbers.

SOLUTION: Because most people are not mathematicians. I know that sounds like a flippant answer, but it's genuinely the answer. There are many words which have a more precise (or even different) meaning for specialists, and the fact is that these words simply have both meanings. The question 'Is a tomato a fruit or a vegetable?' is an all too familiar example: to a botanist, it's a fruit; to most of us, it's a vegetable. So the fact that mathematicians use 'combination' in a more restricted way is irrelevant to almost everybody who uses the locks.

PROBLEM: I know that Sussex and Middlesex are in England. It looks to me as if there is a pattern in names. What does the suffix -sex mean? Where does it come from?.

SOLUTION:
The -sex suffix is from Anglo-Saxon / Old English, with the actual meaning being 'Saxon'. Sussex is essentially 'South Saxon'. Middlesex is 'Middle Saxon'. Essex is 'East Saxon'. Wessex is 'West Saxon'. Most of the wiki pages for these places will have the toponymy definition.