TVXQ! what! What does the name s mean?

As far as I know, it doesn't seem to have any special significance.

At first, SM Company named them five zang-organs, which means they are as important as five zang-organs.

Later Dong Fangbubai, yes, ma 'am.

Someone suggested calling it TVXQ! before debut! . Everyone thought it was good and decided to call it this.