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Perhaps you are talking about "variable variables"
Set Search Time - A google chrome extension. When you search only results from the past year (or set time period) are displayed. Helps tremendously when using new technologies to avoid outdated results.
Most times people try to use it they're doing it for the wrong reason, but there are legitimate uses for it. It's just not something seen in many other languages so it has this "if nobody else is doing it then it must be bad" stigma.