When creating the [variables] tag, the following dialog pops out:

[![enter image description here][1]][1]

After clicking "Yes, I'm sure", the system throws:

[![enter image description here][2]][2]

**So does the [variables] tag exist or not?**

[1]: https://i.sstatic.net/6mB8U.png
[2]: https://i.sstatic.net/fIh4X.png