Yes, English and Greek characters (letters) are the most frequently used symbols for variables.
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The unknowns or variables
Those letters are indeed often used to represent integers. But in practice, it's best to always check what assumptions are made. If certain variables (letters) are meant to be integers only, for example for some theorem, this should be stated explicitly.
1) I learned that you can have as many variables as you want. 2) You can change the variables. 3) Variables is used in an experiment. 4) A variable is something that can be changed, such as a characteristic or value. Variables are generally used in Psychology experiments to determine if changes to one thing result in changes to another.