gtk:status-icon-set-from-icon-name (icon name)

icon -- a gtk:status-icon object
name -- a string with an icon name

Makes the status icon display the icon named name from the current icon theme. See the gtk:status-icon-new-from-icon-name function for details. The gtk:status-icon-set-from-icon-name function has been deprecated since version 3.14 and should not be used in newly written code.