It's our OCLC code.
Since it has no relevance to our name, I hope it will come to stand for "Books Get ILL'ed"
OCLC is currently loading the records from our retrospective batch upload, many of our items are already appearing in WorldCat.
We're a member of LVIS too!
Ask your OCLC-FirstSearch-WorldCat Administrator person to add our code -- BGI -- to the holdings groups you use when borrowing items!
[special shout-out for SWAN readers: remember to look for us in WorldCat--since MLS delivery is fast & efficient!]