Lock on phone bootup

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http://forum.xda-developers.com – Hi all, My brother and I recently purchased two Galaxy Nexus for ourselves.(phone not officially launched in India, where I live). We both have the yakuxw and are awaiting the 4.2 update. As Samsung is taking forever to push it, we are contemplating flashing to a Takju. One strange thing ive noticed is that when my phone boots when the Google logo displays I see a lock at the bottom, but my brother doesnt. Could some 1 tell me what does that mean ? is it the bootloader lock ? Thanks in advance (HowTos)