TPD is "Thermal Design Power" — the maximum amount of heat that a computer component (like a CPU, GPU or system on a chip) can generate and that its cooling system is designed to dissipate during normal operation.

https://www.ted.com/talks/matt_ridley_when_ideas_have_sex

Here's the reference for TB, from our discussion

https://boingboing.net/2018/03/12/the-vim-clutch-a-footpeda.html

https://blog.jim-nielsen.com/2022/a-web-for-all/

Quiet fan