> For the complete documentation index, see [llms.txt](https://trizen.gitbook.io/sidef-lang/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://trizen.gitbook.io/sidef-lang/programming_tasks/u/unicode_variable_names.md).

# Unicode variable names

```ruby
var Δ = 1
Δ += 1
say Δ
```

#### Output:

```
2
```