Signature strike

Is a ‘signature strike’ a special kung-fu move by your favourite character in a beat-‘em-up videogame? Not quite. It’s a kind of ‘drone strike’ where the ‘target’ (or victim) is chosen not because he has been identified, but because his pattern of behaviour — or ‘signature’ — looks suspicious. If you see a drone in the sky above you, try to act normally.

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