[greatpatton]

Same for "2.4 GHz wireless network" but it's supposed to be 2.4 gigahertz if fully spelled. I suppose there is a logic behind but it's not obvious.

[jeroenhd]

I've always assumed "giga" is capitalised because it one might confuse a lower case g for "grams". Technically, 1gm is one gram-meter (grams * metres), whereas 1Gm is a thousand kilometres. You don't often encounter weird combined units like gram-metres outside of physics, except maybe for kWh (kW * 1 hour), but I don't see why you wouldn't be nice to physicists and give them the extra clarity.

Other order of magnitude indicators are capitalised to distinguish them from their smaller counterparts (millimetre/Megametre).

Wikipedia states that the distinction is because units named after a person always start with a capital letter. I've always assumed Hz has to be capitalised to prevent confusion with the hecto prefix (hHz being 100Hz). I don't think there's a unit or order of magnitude that's abbreviated to `z`, so in theory "Hz" could just be "H",

I think Hz is more readable, but that's probably because I'm used to it.

[nayuki]

> assumed "giga" is capitalised because it one might confuse a lower case g for "grams"

Note that m is milli and m is metre; overlap hasn't stopped collisions between prefixes and units.

> "Hz" could just be "H"

No, H is henry (for inductance). https://en.wikipedia.org/wiki/Henry_(unit)

[readthenotes1]

60 watts , later 20 kW.

I don't know, but it seems to me that if they wanted to be scientific they wouldn't be seemingly arbitrary in the capitalization rules

[atoav]

I had structural engineering and electronics in school and especially when you get compound units like Nm (newton meters) not wondering if the N is a newton or the SI-prefix nano is not nothing.

In the end the reason for the weird capitalization is just to avoid situations where that ambiguity will occur.