What is the symbol for long e vowel?

There isn't a single, universally recognized symbol for the "long e" vowel sound. The symbol used will depend on the specific phonetic system you're using.

Here are some common options:

* IPA (International Phonetic Alphabet): /iː/ (the "i" with a colon)

* American English dictionaries: Often use the symbol /ē/

* British English dictionaries: Sometimes use the symbol /i:/

It's important to be aware of which phonetic system you're working with to understand the meaning of the symbol used.