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

[![Are you sure you want to create new tags?][1]][1]

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

[![The tag 'variables' is too similar to 'variables'][2]][2]

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

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