Answer:
Exclamation point.
Explanation:
"Please stop talking!" is an example of a Exclamation point because in this sentence sign of exclamatory is present in the end. Mark of ! used after an interjection or exclamation in order to indicate forceful expression or strong feelings. In the above i.e. "Please stop talking!" has also preset strong feelings so that's why the sign of exclamation is present in the end of the sentence.
