What does the number 9 symbolize in the bible?

In the Bible, not all numbers have a symbolic meaning.

Even those numbers that do have a symbolic meaning, do not necessarily have a symbolic meaning every time the number is used.

The number 9 does not seem to have a symbolic meaning; but seems always to be a literal number.

The Bible is a book of history and prophecy - - thus it does not need to be a complicated book of numerology, as if every number has a deeper meaning.