I understand that the SI standard for units is to have a space between the number and unit:

  1. Unit of measurement and formatting
  2. https://physics.nist.gov/cuu/Units/checklist.html

But, does this apply to quantitative units? To abbreviate 1 Million, is it "1M" or "1 M"? "10k" or "10 k"?

1 Answer 1


This is likely answered by your style guide. For example, in Chicago Style, there is no space (“usually”). In AP, this type of abbreviation is only allowed in headlines for M and B and doesn’t have a space either.

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