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The phrase "a key number" is correct and usable in written English.
It can be used when referring to an important or significant numerical value in a specific context, such as statistics, data analysis, or financial reports.
Example: "The report highlighted a key number that indicated a significant increase in sales over the last quarter."
Alternatives: "a crucial figure" or "an important statistic."
Exact(14)
Unless you've got a key number of people around who are banging that drum the heritage will suffer".
Finally, a key number in extragalactic astronomy and cosmology is the Mass-to-Light ratio (M/L) for a given object or system of objects.
When jet fuel was going through the roof a few years ago, the pilots at Southwest Airlines identified fuel usage as a key number.
A key number in this system is the traffic intensity the number of problems relative to the resources devoted to problem solving.
It relates sensible heat to latent heat and is a key number in solving the problem of heat transfer during solidification or melting.
But today, as Kelly points out, a key number of the current cabinet are practising Christians, including Tony Blair, Gordon Brown, Tessa Jowell, David Blunkett, Hilary Armstrong and Douglas Alexander.
Similar(46)
A key figure — the precise number of people missing in Mexico — remains unknown.
In a startup, the key number might be the dollar value of sales or net operating cash.
He pulled out a statement showing his former key number and a list of bunnies he had saved from an August 1977 visit to the resort.
For a small company, the key number might be something as simple as net profit.
Which is what it takes to make 60, and not a simple majority, the key number.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com