Or even `#show "csharp": [C\#]` and then just write `csharp`. Though then you couldn't include the actual text "csharp" in your document, should you wish to, so

Or even `#show "csharp": [C\#]` and then just write `csharp`. Though then you couldn't include the actual text "csharp" in your document, should you wish to, so perhaps defining the variable is a better option.