Today's weather is really good. What number should I use in the future?

Period. Sentence is the basic unit of language use, which consists of words and phrases. It can express a complete meaning, tell others a thing, ask a question, indicate a request or stop, indicate a feeling, indicate the continuation or omission of a paragraph. Because this is a complete sentence, followed by a period. A period, a punctuation mark, is in the form of ".",which means "."in English. Punctuation used at the end of a statement.