It's not clear what you mean by "symbols a rock under water". Could you please rephrase your question?

For example, are you asking:

* What symbols are used to represent a rock underwater on a map or chart?

* What are the symbolic meanings of rocks underwater in different cultures or mythologies?

* What are some ways that rocks underwater can be symbolic of something else?

Please provide more context so I can understand what you are asking and give you a helpful answer.