What does the letter "e" stand for after metric measurements found on products sold in Europe? For example ml e, or kg e? (anon) It's not actually an "e", but the similar looking "℮", or the "Estimated" sign. It is used within the European Union to show that the measurement isn't exact, but that it falls within a range allowed by preset rules. There are specific allowable variances for the weights or volumes being estimated.