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Transfer speeds of physical interfaces (PCIe, Ethernet, DDR, HDMI, DisplayPort, USB, SATA, whatever) are usually decimal.

Among other things, hard drive labeled capacities are noteworthy for using the decimal definitions.

Hah! That's a major pet peeve of mine.

So, anyone who uses Windows has probably noticed at some point that "GB" "MB" and "KB" are the power-of-2 variants. Whenever I see one of those tech YouTubers say the formatted capacity of a 1 "TB" drive is 931 "GB" I just cringe. Most storage vendors use the power-of-10 definitions and Windows uses the power-of-2 definitions. 10^12 bytes / 2^30 = 931.32, so no, formatting your drive does not make 7% of the space just disappear.

I am aware of k VS Ki but often see K as a shorthand for Ki.