ELI5: Explain Like I'm 5

FO(.)

Fo(.) is a type of punctuation mark – a symbol usually used at the end of a sentence to add some extra emphasis, or to help make a point. The fo(.) symbol is sometimes called an exclamation point, because it brings attention to something important. When a person types a fo(.) in a sentence, it shows that they are excited, passionate, or emphatic about what they are saying.