The period.
The Period, or Full Stop, is used to mark an entire and independent sentence, whether simple or compound.
Distinct sentences.
When a sentence, whether long or short, is complete in respect to sense, and independent in respect to construction, it should be marked with the period: as,
"Every deviation from truth is criminal. Abhor a falsehood. Let your words be ingenuous. Sincerity possesses the most powerful charm."
"The force of a true individual is felt through every clause and part of a right book; the commas and dashes are alive with it."--R. W. Emerson.