DO YOU KNOW what is the structure of the BXXX file number

[aram_golbaghi]

i am doing a research and i want to know if anyone know what is the structure of the BXXXX file number??

B05 X XXX XXX

i have seen most file comes with B05 and the rest varies,,,
i want to know what is the structure?
does it have a meaning or a simple serial number??

share your ideas please

 

[aram_golbaghi]

anybody??

pulling up,,