That depends, if you have the fortune (misfortune?) of using the CAD software Creo/ ProE from PTC then spaces are verboten since they haven’t progressed from the days where the software was written for UNIX.

Using - is much nicer.

Only if you want my respect

never use spaces. never use special characters like |$&";?*'. avoid non-ascii. case is preference, i personally use kebab-case

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