It is an “octothorpe”.

True - Spandau Ballet

“If so why don’t people buy more 70’s cars?”. IMHO, this is actually the whole point of the OP’s question.

Everyone is concentrating on the crumple zones and safety at the crash. Remember that modern cars have features that make it easier to avoid the crash in the first place. Antilock brakes. Traction control. Lane assist/warning. Better headlamps, adaptive headlamps. Better suspension and handling. All things to avoid crashes.

All good reasons to avoid the 70’s car.

Thanks for the feedback. I will make some changes to the article. IPv6 wasn’t even on my radar since I haven’t got around to using it myself yet.