Greek symbol in label or data grid

I like to use greek symbols such as micro, sigma, and etc in a label and also datagrid title (column name).
It seems Unicode is not working.

I’ve had no problem using the Unicode trademark symbol in a label.

Do you have a simple example app you can clone for others to look at?

Thank you. It is solved.

self.data_grid.columns = [
{ “id”: “A”, “title”: “Index”, “data_key”: “index” },
}