What in exclamation point?

The exclamation mark (!), also known as an exclamation point or an exclamation mark, is a punctuation mark that indicates strong emotion, such as surprise, anger, or joy. It can be used after an interjection, such as "Oh!", or at the end of a declarative sentence, such as "I'm so happy!". The exclamation mark can also be used in place of a period at the end of a sentence to indicate emphasis, such as in the sentence "I told you so!"