I do not care about downvotes on here.
> You can use virtually any character as part of your variable name. Lispers
This is not a good thing.
> However, it is nice that for a domain specific problem, you can just invent new syntax and use it.
This is equally not a good thing.
1. I don't care 2. Not a good thing
Is not adding anything to the conversation. Have you examined your internal need to spend time commenting on this?
```[a-zA-Z_][a-zA-Z0-9_]*``` is such a universal and useful convention that I find myself using it even when the domain allows other characters (bash, Xnix filenames). Obviously this is English-centric so I would include other language constructs if I were in a country with another dominant language.
In fact even though I have the ability (languages supporting unicode and a QMK keyboard) to use symbols, e.g. Greek letters for math, I don't, because I know it's a hassle for anyone else.
> You can use virtually any character as part of your variable name.
> invent new syntax
are a hassle and anti-pattern for the same reason.
However if these features are exposed through clean abstractions in a language that is syntactically bare to begin with, you might have different thoughts.