Not sure how much degree the B is, I can't remember whether I have ever read this anywhere. The initial Bitcoin logo wasn't this which was later even changed by Satoshi Nakamoto into the current logo of bitcointalk forum. Later on, bitcointalk user bitboy came with the current version though his thread doesn't show the image he posted. Check here- https://bitcointalk.org/index.php?topic=1631.0 though you can check the original; thread here- https://web.archive.org/web/20130524191250/https://bitcointalk.org/index.php?topic=1631.0

1st Version



2nd Version by satoshi, is Bitcointalk logo now.