A full stop should only be used after unit symbols at the end of a sentence. It is not used immediately after the symbol itself if it is not the end of a sentence.
NCERT Book Curiosity Science Class 6
Class 6 Science NCERT Chapter 5
When should a full stop be used with unit symbols?
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A full stop should be used with unit symbols only at the end of a sentence. For example, write “The tree is 3 m tall.” without a full stop after “m,” but include a full stop after the sentence if it is concluding.