How to change the font of GtkLabel?

General Usage
1

How to change the font of GtkLabel? In particular I’m looking for greek characters.

2

i cannot test this right now, but in theory GtkLabel should be displaying Unicode i.e. if your current font contains greek characters, they should be displayed.

3

Thank you for the prompt answer. To enter e.g. small lambda use Ctrl+Shift+U then 03bb.