When one can call oneself expert

Hi, this is a conceptual question, if you can please

I want to expose a course about 10g new features, and I was thinking when I could say
Juan Carlos Reyes ORACLE EXPERT (I'm not going to say that still)

I only want to know

What have to pass to use such credential.

how much books write?
How years of experience?
Which kind of recognition?
etc,

Could you giveme some clue?

Thanks  

Juan Carlos Reyes Pacheco    

Oracle Certified Professional 9i,10g  

Developer Certified Professional 6i

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