What is this chart type?

I was reading the article Marketing Analytics Is Broken. Salesforce Is Fixing It With AI (And IoT) on Forbes and I was wondering if anyone could tell me if there was a name for the type of chart they are using on the Salesforce Marketing Cloud dashboard. It is the one the blue lines and its intersections look a bit like highway on and off ramps?

https://thumbor.forbes.com/thumbor/960x0/https%3A%2F%2Fblogs-images.forbes.com%2Fjohnkoetsier%2Ffiles%2F2018%2F06%2Flifecyleinsights.jpg