A cog is wheel or bar with a series of projections on its edge that transfers motion by engaging with projections on another wheel or bar.
So a cog looks like a circle with square shaped points around the edge.
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Under the snow
it is one of the snow glumps use gabys lasar to find it
under the lump of snow closest to the thing your trying to activate
you have to click on gabby then go on the app Gabby's Laser
Just do the quest or look on wiki.