Quick Question

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Hi guys! I apologize if this has been asked before, but: in the anime, during the Lancelot's launch sequence, Suzaku typically says something like, "Activate/Activating M.E. Boost." Anyone know what the M.E. stands for, by any chance?

I know, seems like a silly question, but it's kind of important to me, so Any help would be very much appreciated! ^_^