What does E stand for?

What does E mean?

E	Explore Community » Scouting
E	Efficiency Academic & Science » Physics
E	Exit Miscellaneous » Unclassified
E	Existence Miscellaneous » Unclassified
E	Effectiveness Miscellaneous » Unclassified
E	Eating Miscellaneous » Food
E	Enlarge Community » Media
E	Expired Miscellaneous » Food
E	Excellence Miscellaneous » Unclassified
E	Entity Miscellaneous » Unclassified
E	Entwicklung Miscellaneous » Unclassified
E	Emitter Governmental » Military
E	Emitter Academic & Science » Electronics
E	Everyone Community » Religion
E	Everyone Community » Film Censorship
E	Eastern Community » Media
E	Eastern Academic & Science » Meteorology
E	Electric Academic & Science » Physics
E	Eastern Academic & Science » Ocean Science
E	Eastern Community » Religion
E	Eastern Community » Sports
E	Eastern Governmental » Transportation
E	Enhanced Governmental » Military
E	Effort Business » General
E	Exercise Medical » Physiology