Is it a model number for Aviator style sunglasses (like those from Ray-Ban, Porsche Design, or Carrera)?
Are you referring to a specific patent (e.g., T 0989/23) or a statistical value from a study? P 0989 AVI
If you can provide the or the type of product (e.g., "P 0989 AVI sunglasses" or "P 0989 AVI computer part"), I'll be happy to find or write a detailed review for you. Is it a model number for Aviator style