Does Nibbana mean not self? I have found a text which states that 


  nibbāna is a description meaning not-self.


The meaning of the text is clear. Nibbana is nothing but not-self.
Moreover I have also found a sutta(SN22.45) which says that after understanding and realizing not-self the person attains Nirvana.


  At Savatthi. “Bhikkhus, form is impermanent. What is impermanent is
  suffering. What is suffering is nonself. What is nonself should be
  seen as it really is with correct wisdom thus: ‘This is not mine, this
  I am not, this is not my self.’ When one sees this thus as it really
  is with correct wisdom, the mind becomes dispassionate and is
  liberated from the taints by nonclinging


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  “By being liberated, it is steady; by being steady, it is content; by
  being content, he is not agitated. Being unagitated, he personally
  attains Nibbāna.


My question is :Does Nibbana mean not self?
Everything is not-self including Nibbana. But Nibbana is much more than that. It is the end of suffering.