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.

Thanks, I thought it was some acronym.

What does . mean?

It is used for several purposes, the most frequent of which is to mark the end of a declaratory sentence. (why are we doing this?)

I thought English uses PERIOD to verbally mark the end of a declaratory sentence, not DOT. That's probably where the confusion comes from.

I should have written "period".

To be strictly accurate, English uses 'full stop', and American English uses 'period'.