Here's a picture:
Actually, it'd be helpful to know what they all meant.
Arqade is a question and answer site for passionate videogamers on all platforms. It only takes a minute to sign up.
Sign up to join this communityThis icon indicates your currently selected target. If found and scanned, this target will appear on the HUD with this icon, and if you know where the target is through intel, their approximate position will be displayed on the map.
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.