In American English, period is the term for the punctuation mark used to end declarative sentences. In British English, the mark is usually called a full stop. Neither term is right or wrong. They’re just different ways of saying the same thing. Full stop is a punctuation mark placed at the end of a sentence. The full stop glyph is sometimes called a baseline dot because, typographically, it is a dot on the baseline. This term distinguishes the baseline dot from the interpunct (a raised dot).