Did a little research on this since I just learned cool new commands thanks to you, Harry.
display thermal zones and information about them.
In regards to ACPI thermal management, the system designer logically partitions a hardware platform into one or more physical regions known as thermal zones. When a thermal zone overheats, the OS takes possible actions to cool down any devices in that specific zone.
Evidently thermal zones keep track of a few things such as what hardware is in the specific zone, what the threshold(s) are/is and what to do when it reaches that point. There's also passive vs active cooling precautions as well.
Evidently lots of info regarding thermal management in Chapter 11 - ACPI - Advanced Configuration and Power Interface
Pretty neat stuff!