The “system tray” or notification area is normally used for transient icons that indicate some special state. For example, a system tray icon might appear to tell the user that they have new mail, or have an incoming instant message, or something along those lines. The basic idea is that creating an icon in the notification area is less annoying than popping up a dialog.
Fluent builder for gtk.status_icon.StatusIcon
Fluent builder implementation template for gtk.status_icon.StatusIcon
Module for StatusIcon class