I have a different understanding. Hz is written with a capital H not to pay
homage to Mr. Heinrich Hertz, but more simply because all measurement units
begin with a capital letter.

That contradicts units like the gram (g, kg, mg), the meter (m, cm, mm, km)
the liter/litre (l, ml), the second (sec, msec)... or at least how they are
presented in all my science texts, and...

I was referring to all the measurement units that bear the name of a scientist.
Those units all begin with a capital letter


Homage was instead paid to Mr Kelvin when they decided that the capital
K is assigned to the temperature measurement unit (kelvin degree) instead
than to the 1000 multiplier.

...Fahrenheit (F), Rankin (R), Henry (H, mH), Farad (F, pF, nF), Volta (V),
Ampere (A), Gauss (G, mG), Tesla (T), Watt (W, mW, kW, MW)...

Your examples confirms that all measurement units bearing the name of a
scientist begin with a capital letter. The homage to Kelvin consists in the fact
that his name was given to the temperature measurement unit even though the
letter K had already been reserved for the 1,000 multiplier. So, the 1,000
multiplier was renamed from K to k, and the K was given to the temperature
measurement


This explains why kilohertz is written with a small k, an exception to the
general rule that all multipliers have a capital lettere (kHz, MHz, GHz,
THz).

...deci (d), centi (c), milli (m), nano (n), pico (p), femto (f), atto (a),

The ones you mention are not multipliers (i.e. 1,000, 1,000,000, etc,) but
sub-multipliers (i.e. 0.001, 0.000001, etc) . The general rule is that
multipliers have a capital letter, the sub-multipliers have a small letter



Am I missing your sarcasm?

You must have missed it, because I am always quite serious and never sarcastic.

73

Tony I0JX