The Samsung logo, with an icon of an unlocked padlock, and the word "Custom" (this is the very first boot screen, before the boot animation and the Galaxy S3 logo), so it's the bootloader screen.
The only way I can replicate this is by taking out the battery and replacing it. Simply rebooting the phone does not show the icon. I suppose this could have been due to one of three things:
(all as directed by http://forum.xda-developers.com/show....php?t=1756885 for reference )
flashing the rooted boot image using Odin
installed custom Clockworkmod recovery
flashed custom boot image
Everything still boots properly, I don't have a brick. Is anyone else experiencing this that perhaps didn't follow these three steps?