That's basically multiplying N and m, so you could use a dash like N-m:
https://www.convertunits.com/info/N-m
That's for the torque unit, Newton meter (which could also be an energy unit), normally with a symbol N⋅m that has the centerline dot as you mentioned.
It's definitely a different unit than if you divide, like N/m, which is surface tension:
https://www.convertunits.com/info/N/m
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| 11/04/2020, 5:17 PM | dot between letters of abbreviation |
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