What does the skull icon with the red waves on the Sauron's Army screen mean?
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Here's a picture: 
Actually, it'd be helpful to know what they all meant.
Best Answer
I don't know the PC controls, but if you go into the map screen, and press RB/R1 (Xbox/PS), it will bring up the legend which tells you what every icon means.

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What does the skull mean in shadow of Mordor?
Those are the triangles over enemies' heads. A Gold skull means it's a captain that's also a quest objective. A Green Skull means the captain is weak and can be grabbed. Follow this answer to receive notifications.How to get power points in shadow of Mordor?
How to earn Power. The easiest way to earn Power is by killing Captains and Warchiefs and completing Power Struggles mission. Some of these missions can be easily completed \u2013 like Duel, Beast Hunt, Trial by Ordeal, Execution.How do you grab and hold in shadow of Mordor?
Do Shadow strike (not shadow kill) R2+X. When he is down grab him with R1 and move away from other Orcs and make him as your cover. If you hit by an orc then you'll leave him and you have to grab him again and the timer starts again.What did Sauron look like?
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