\/ - or - /\ for example.
The backslash went on to find use in early UNIX programs and today is party of a typical QWERTY keyboard, usually to the right of the bracket (and braces) keys. Other terms for the mark include slosh, reverse virgule, and reverse slash.
In text, (such as in a chat room online) "/" is understood that it is not to be spoken, but sets the platform for an "action" or emotion one is trying to express. the reason that this tool is used in text is to express things that can only be expressed in person, and not through text.
When using "backslash" out of text, it has to be spoken, then it is followed by the emotion or "action". the reason that this is used at all, is to exaggerate a thought, feeling, or show a desire to do something, as it is usually exaggerated in the text form as well.
Person 1: I just bet my friend 300$ that he wouldn't eat a pile of dog shit... now I'm out 300$ dollars!
Person 2: OMG! /vomit
Person 3: Wtf? Seriously? /dies
In real life:
Boss: We are having to cut back on workers, and you are going to be the first one to have to go. I'm sorry, You're fired.
Fired Employee: What?! Backslash slap! (Does not actually slap him)
Girlfriend: It was nice having sex with you... but I wish your cock was a bit bigger.
Boyfriend: Er.... backslash embarrassed.
Both "Backslash" and "/" can be used in all of the exact same ways.