The appmenu tag is for the global application menu AKA
appmenu-indicator, that allows screen real estate to be conserved in desktop environments (DE's, AKA ‘graphical shells’) that support it. The applications-menu tag seems to be a better fit for the launcher menu ‘Applications’ found in various DE's, especially since the tag has an ‘s’.
appmenu × 192 applications-menu jokerdino♦ jun 13 '12 at 14:11 0 indicator × 666 appindicator × 6 jokerdino♦ jun 25 '12 at 15:34 27 jun 14 at 8:41
Where is the Applications menu
What desktop environments feature a searchable "Start" menu/launcher?
How do I move items in the Applications (or Main) Menu Around?
Other tag currently in use that might need consideration: globalmenu
Globalmenu is related but distinctly separate. appmenu is prevalent across DE's whereas globalmenu is Gnome only. People often call ‘appmenu’ ‘globalmenu’ (the reverse is not so true), so having global-application-menu would both appear in suggestions when typing ‘global’, and further distinguish from applications-menu.