What is A# ?

[diamond]

Hello Gurus,
While filling the forms to file for 485, I came across a field for filling the A#? Could someone please tell me what this A# is? The doctor too asked for it while medical examination. I think this is asked for in I693 too.
Please help.
Thanks in advance.

 

[Frank Lee]

No Title

You can leave it blank.

 

[Para]

No Title

A# is Alien Number. You can find it on your I-94.