The metric system.
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Yes. In 4th and 5th grade, we got E- (lowest) E (middle) and E+ (highest) for things like Music, Art, Gym and Computers. We didn't use this system for Science, Math, LA, Social Studies, etc., however. Now, in my school we don't use the "E" system at all. It's just A-F.
E numbers are food additives. The 'E' stands for European, as this is a standard set in Europe throughout the European Union.
E is not used as a symbol in the roman numeral system.
No. For any base, n, you use the digits 0 to (n-1) for all numbers within that system. If, as in the case of the hexadecimal system (base 16), 0-9 are not sufficient to take you to n-1, you "borrow" some letters of the alphabet. In this case A ,B, C, D, E and F.
He did not use any databases to come up with E=mc^2.