The mark on the ground looked like a question mark. Later on in conversation, it was referred to as a circle for a target to mark the location. My thought is that the plane crashing down there smudge the circle so it looked more like a ?
I believe this is the ? Eko's brother wanted him to find. There is also the possibility that he was referring to the ? on the blast door map. I'm guessing we haven't heard the last of ?
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