what is this nuke marking? Nuke attack capabililty?

[SBD-3]

 

[gambit]

Nope...Standard warning marker for 'radiation'.

 

[Capt.Popeye]

Radiation Hazard Warning; from the Radar scanner. One may see it more prominently on ships in the vicinity of antennas and scanner arrays. Even safe distance markings may be visible.

 

[Akasa]

You'd see the same thing on microwave ovens if they were military-issued.

 

[Luftwaffe]

But its on my computer.