Variables
About two thousand years ago, the Greek philosopher Epictetus said that:
The materials of action are variable, but the use we make of them should be constant.
The ancient Greeks loved deep concepts, such as atoms, so it is not surprising that they invented information architecture and the notion of separating a reference to data from the actual data it contains. Wikipedia has a good definition for a variable. In the context of computer science, it is "A symbolic name given to some known or unknown quantity or information for the purpose of allowing the name to be used independent of the information it represents."
We use variables all the time. For example, when we think (or perhaps prefer not to think) about our account balance, the term ...
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