E Major chord
Secondly, can I leave my guitar in open E?
#1 Use Open E Tuning But Don’t Leave It There
This will limit the amount of time the extra tension is on the neck. However, this is cumbersome. It will take time to tune up to Open E and some re-tuning, as the neck settles into the new tuning, will be required.
Beside above, how do you play an open E chord?