The letter "e" is present in Latin and Cyrillic alphabets. It usually represents vowel sounds close to [ [i:]] or [ [ɛ]] depending on its position in the transcription.

The lowercase letter "e" is a symbol for electron, elementary electric charge, and the base of the natural logarithm. It's generally used for representing physical phenomena and quantities in textbooks, scientific papers, and collections of problems, along with letters from [URL /blocks/mathematical-alphanumeric-symbols/ mathematical alphanumeric symbols].

This symbol is suitable for writing words in both Latin and Cyrillic scripts. It will also look appropriate in scientific papers. Double-struck "e" differs from the standard "e" by having an additional outline, making it more prominent in any text and allowing it to be distinguished from standard mathematical notations.