Dreams dictionary: O
Dreams dictionary: Interpretation 1
To see the letter "O" in your dream signifies an exclamation of surprise as in "oh!". Alternatively, the letter O implies that you need to open wide. Perhaps there is something that you need to open up about and vocalize. It may refer to a sexual innuendo as in "the big O" or orgasm. This letter may also share the same significance as the number zero or a circle.