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* The first non-prime odd number.

The square of 3.
The square root of 81.
In the expression "on cloud nine", a symbol for elation and well-being.
The winner in the "sans serif lower-case g look-alike digit contest"
1001
the second positive digit that is invalid as an octal number...
For any prime p, not equal to 2 or 5, there are infinitely many numbers consisting only of 9's that are divisible by p. For instance:

     99 / 11 = 9
     999999 / 7 = 142857
     (Any one familiar with number theory should know this - just think Fermat :-)