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Two bullet points (••) are used to surround a sarcastic comment that is said, this means you can see when your mate is being sarcastic, as tone can be hard to read through messages. A simple way to convey a sarcastic tone through a text.

Dave: hey Dan, I bet your mum has a massive dick
Dan: • yeah of 'course she does •

Millie: • Dan is such a good boyfriend •
Belle: omg Mil what's he done now I knew he was a sly snake we should leak his dick pics