If you mean the square under the portal, that means that the portal in question is a "Scout Volatile". If you scan the portal and gain Scout controller on it, you'll get 2 additional points towards the "Scout Controller" badge in addition to the 1 point you normally get for Scout Controller. The volatiles change from time to time, so it might appear on a portal you already Scout Controlled, in that case, you'll either have to wait until someone else takes the position for you or, after 30 days, reclaim it yourself.
If you mean the yellow under the portal, that's only shown when you have your map layer set to "Scout Controlled". Map layer control is the button below your compas.
The yellow circle under the portal means you have been Scout Controller of that portal. The yellow brackets (box) means you got 3 Scout Controller points for it, instead of the usual 1 point. (As said above, sometimes Niantic changes which are volatile, but it'll probably stay volatile for a year or longer..
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If you mean the square under the portal, that means that the portal in question is a "Scout Volatile". If you scan the portal and gain Scout controller on it, you'll get 2 additional points towards the "Scout Controller" badge in addition to the 1 point you normally get for Scout Controller. The volatiles change from time to time, so it might appear on a portal you already Scout Controlled, in that case, you'll either have to wait until someone else takes the position for you or, after 30 days, reclaim it yourself.
If you mean the yellow under the portal, that's only shown when you have your map layer set to "Scout Controlled". Map layer control is the button below your compas.
The yellow circle under the portal means you have been Scout Controller of that portal. The yellow brackets (box) means you got 3 Scout Controller points for it, instead of the usual 1 point. (As said above, sometimes Niantic changes which are volatile, but it'll probably stay volatile for a year or longer..