The choice of a token to represent an unknown is wide open. Commonly, x and y are used, but one may use any letter of the alphabet, particularly if it has some phonic association. c is often used as a token for the speed of light; as a substitute for the word celerity.
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Ah, I see you're curious about algebra, friend. Expressions that use a letter to represent an unknown quantity are called variables. They help us solve problems and equations by giving us a way to work with unknown values in a clear and organized manner. Just like adding colors to a painting, variables add depth and meaning to mathematical expressions.
variable
You can represent values using variables. This can only be done with whole numbers.
an unwillingness to understand alternative points of view and to take the values they represent seriously
The symbol used between two code numbers to indicate that a range is available is the hyphen (-). In coding and data representation, the hyphen signifies a continuous sequence or range of values between the two specified numbers. This notation is commonly used in programming languages, spreadsheets, and various data processing applications to represent a series of values within a specified range.