Each Emacs frame always has a title, which appears in window decorations and icons as the name of the frame. The default title is of the form /invocation-name/@@/machine/ (if there is only one frame) or shows the selected window's buffer name (if there is more than one frame). You can specify a non-default title for the initial Emacs frame with a command line option:

-T title, –title=/title/

@opindex -T @opindex –title Specify title as the title for the initial Emacs frame.

The --name option (Resources) also specifies the title for the initial Emacs frame.