# 0068: Forbidden character in identifier

The compiler finds an forbidden character in a [variable](https://docs.sannybuilder.com/language/data-types/variables) name, [label](https://docs.sannybuilder.com/language/data-types#labels), or any other identifier. Only digits, letters and the underscore (`_`) are allowed.

**Possible solutions:** update the name to include only allowed characters.