https://www.gamespot.com/articles/e3-2018-what-does-e3-stand-for/1100-6459333/

June is upon us, which can only mean one thing: It's time for E3. We'll soon be inundated with countless game announcements, trailers, and demos, including what's sure to be some nice surprises--assuming they don't all get leaked first. But what does E3 itself stand for?