I heard recently that's there's a proposal to start pricing Bitcoin not in the cost of 1 BTC but in 1 satoshi. The idea being to make it seem much cheaper to stack bitcoin.
satoshi is one of Bitcoin units and you can make a chart with any of Bitcoin units, it's not big matter. The fact behind this is the same, reflection of Bitcoin price through different units.
The following chart is Satoshi per dollar which is an inverse chart of $ per satoshi chart. Instead of showing how much does 1 satoshi cost, it show us an inverse information: how many satoshis one $ can buy over time.
https://charts.bitbo.io/satoshi-per-dollar/