This one is a treemap by the article's definition but is called a heatmap for as long as I can remember: https://www.marketbeat.com/market-data/sector-performance/
[0] https://github.com/jmforsythe/Git-Heat-Map
This one is a treemap by the article's definition but is called a heatmap for as long as I can remember: https://www.marketbeat.com/market-data/sector-performance/