What does E stand for?

What does E mean?

E	Engineering Miscellaneous » Unclassified
E	Either Internet » Chat
E	Easily Miscellaneous » Unclassified
E	Easy (phonetic alphabet) Governmental » Military
E	European Miscellaneous » Unclassified
E	Eric Miscellaneous » Unclassified
E	Experiences Miscellaneous » Unclassified
E	Easier Miscellaneous » Unclassified
E	Emergency Miscellaneous » Unclassified
E	Extension Business » General
E	Efficient Miscellaneous » Unclassified
E	Edge Business » Products
E	Efficient Business » Products
E	Emergency Medical » Hospitals
E	Electronic Academic & Science » Electronics
E	Error Community » Sports
E	Edit Community » Media
E	Earth Academic & Science » Astronomy
E	Energy Academic & Science » Chemistry
E	Employment Business » Positions
E	England Regional
E	Evidence Community » Law
E	Eye Medical » Physiology
E	Economic Business » General
E	Excellent Academic & Science » Universities