What's your pet hate / pet peeve?

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What is your pet hate?

A pet peeve , pet aversion , or pet hate is a minor annoyance that an individual finds particularly irritating to a greater degree than the norm.

Tell me what really annoys you, especially if it concerns the forum.

Mine's the incorrect representation of SI units.
International System of Units

I saw another example today:

i am going to use Rf 433 mhz red pair .

It's not 'mhz', it should be MHz.

The SI unit of frequency is the hertz, represented by the symbol Hz.
It is named after the German physicist Heinrich Hertz, so it gets a capital 'H'.

'm' stands for milli.
You need to use 'M' when you mean mega.

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Very often, even in technical literature or datasheets, I see "hz" with a small letter. Also in many languages, units of measurement begin with a small letter.

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Don’t take a commonly made mistake for a rule. The guy’s name was Heinrich Hertz, so we use the capital H.
With the M and m the capital one is used for something bigger. In our field often B and b are confused, B being byte and b being bit.

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The name of a person - Hertz - of course with a capital letter, and the name of a physical unit is hertz with a small letter, to distinguish between a person and a physical unit.
I think this approach is logical

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"Thank you."
"Not a problem."

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