What does EJ stand for?

EJ. Exajoule (10^18 Joules)

EJ. Edgerrin James (NFL player)

EJ. External Jugular Vein

EJ. Edward Jones

EJ. Expansion Joint (general construction)

this are some possible meanings.

If some more information was given in this question, it would have better to answer more accurately. But some of the possible abbreviations for EJ are as follows:

EJ: Electronic Journalism

EJ: Euro Japan

EJ: Edward Jones (investing company is USA, Canada and UK)

EJ: Exajoule

EJ: Electronic Jamming

EJ: Escort Jammer

EJ: Electronic Jockey

EJ: Emergency Jettison

EJ: External Juggler vein

EJ: Economic Journal