Related to [the [var] burniantion proposal](https://meta.stackoverflow.com/questions/383150/this-tag-invariably-needs-to-be-burninated). I first noticed the tag thanks to [this important JavaScript question](https://stackoverflow.com/questions/762011/whats-the-difference-between-using-let-and-var)

[let](https://stackoverflow.com/questions/tagged/let "show questions tagged 'let'") (about 500 questions)

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> In Lisp-like and functional languages, introduces a list of local variables, each (possibly optionally) with its initial value.
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As far as I can tell, `let` is simply a variable declaration syntax, much like its cousin `var`. More importantly, only 39 are also tagged [lisp](https://stackoverflow.com/questions/tagged/lisp "show questions tagged 'lisp'"), which means the excerpt is wildly wrong (128 are JS questions). Just like [the [use] burnination](https://meta.stackoverflow.com/questions/342178/useless-use-now-used-less), this appears the be a syntax tag only, meaning that

* Most questions could be retagged [syntax](https://stackoverflow.com/questions/tagged/syntax "show questions tagged 'syntax'")
* Some JS questions could be tagged [scope](https://stackoverflow.com/questions/tagged/scope "show questions tagged 'scope'") (this is scoping syntax in that language)

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> Does it describe the contents of the questions to which it is applied? and is it unambiguous? 
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Not necessarily. I don't think that LISP, Haskell and JS use it exactly the same way

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> Is the concept described even on-topic for the site?
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Scope and syntax are on topic

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> Does the tag add any meaningful information to the post?
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No. Take [this Lisp question](https://stackoverflow.com/questions/49902313/prog-vs-let-in-lisp-performance-difference). There's no "prog" tag because that's simply syntax. [syntax](https://stackoverflow.com/questions/tagged/syntax "show questions tagged 'syntax'") would be more appropriate here, and also eliminates the need for [let]

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> Does it mean the same thing in all common contexts?
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Again, no. JS is the newcomer here and it doesn't seem that JS uses it exactly the same way other languages do.