What does LEL stand for?

What does LEL mean?

LEL	Lower Explosive Limit Academic & Science » Electronics
LEL	Lower Explosive Limit Governmental » Military
LEL	Lower Explosive Limit Governmental » NASA
LEL	Lower Explosion Limit Miscellaneous » Unclassified
LEL	Lower Explosive Limit Academic & Science » Architecture
LEL	Lake Erie League Community » Sports
LEL	Lake Evella, Northern Territory, Australia Regional » Airport Codes
LEL	The Large Endowment League Miscellaneous » Unclassified
LEL	Lilly(eli) Business » London Stock Exchange
LEL	large extracellular loop Medical » British Medicine
LEL	lower explosive limit (!) Medical » British Medicine
LEL	lowest effect level Medical » British Medicine
LEL	lymphoepithelial lesion Medical » British Medicine