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My father told me of once that when he was working at the RAF research Establishment at Farnborough, someone was was very pleased to have created a circuit which would plot a Chad on an oscilloscope. A little recursion...

That's a band-stop (notch) filter. The inductor lets through low frequencies, and the capacitor lets through the highs. Stuff in between gets blocked.

V is a fascinating novel, and Kilroy shows up a few times. My mind went here immediately as well, as probably would happen for any reader of this work.

WWII is just one of many eras that V dabbles in. I imagine many on HN with an appreciation for literature and history would enjoy it.