E is the most common letter in English and is read as energy and everyday expression. In a dream it often points to a word or name it begins — worth asking what it brings to mind.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.