What is the difference between e-fit and eee fit?

Could you please clarify the distinction between "e-fit" and "eee fit"? I understand that both terms may relate to some form of electronic fitting or adjustment, but I'm unsure of the specific nuances that differentiate them. Are they used in different industries or for different purposes? Is one more modern or advanced than the other? I'd appreciate any insights you could provide to help me understand the differences between these two terms.