Circle = possible to create a character
X = not possible / currently blocked

But I should also mention that the information on that webpage isn't live. It's only updated at periods throughout the day (times are listed at the top of the page).

The actual servers themselves are constantly changing whether or not you're allowed to create characters so realistically this information isn't much good, it's just at that point in time, that was what the situation was, it might have changed less than a minute later though