[J5892]

https://en.wikipedia.org/wiki/Multiple_discovery

"Multiple Discovery" is kind of on the nose, but it works.

[spockz]

I think “Zeitgeist” is the prevalent term here.

Or maybe it more the cause of multiple discovery, reading the Wikipedia page: https://en.wikipedia.org/wiki/Zeitgeist

[randomswede]

Or possibly "steam-engine time".