This face can be used by typing in a colon, and then the number 3 key. This is meant to reference anime faces and how expressive they are

It's supposed to be a smile face, representing cuteness, the face that anime characters make sometimes ,but in fact it's used as a dirty or rape face

A person kissing in text

When you're kind off irritated with what one said.

A wrinkly kissy face

3<3 is a widget for a butt shooting out a cloud of fart. You can even make the fart emphasis more powerful by typing in more <'s like 3<<<<<<<<3 or 3<3<3<3<3<3<3 It can often be mistaken for a heart <3 widget though.