It's a connected scatterplot. There's quite common in certain contexts (e.g. the Phillips curve in Economics). The lines indicate the joined points represent s

It's a connected scatterplot. There's quite common in certain contexts (e.g. the Phillips curve in Economics). The lines indicate the joined points represent successive measurements. There's a nice paper describing the history and evaluating their effectiveness [1] [1]: https://eagereyes.org/papers/the-connected-scatterplot-for-presenting-paired-time-series https://eagereyes.org/papers/the-connected-scatterplot-for-p...