General Please help identify this icon (Picture attached)

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http://androidforums.com – Ever since the most recent Verizon update to my GS3, I noticed this icon show up every now and then. I've never been able to grab it on a screen shot because it only flashes for a second. I was helping my brother activate his new GS4 when the icon stayed on long enough for me to grab a photo. Anyway, its the one in the left that looks kind of like an eye with 3 lines above it. Thanks for your help. (General)