Another method of expressing sarcasm is by placing a tilde (~) adjacent to the punctuation. This allows for easy use with any keyboard, as well as variation. Variations include dry sarcasm (~.)

TIL - I’m an engineer & when I email colleagues, I will use ~ in a sentence to mean “about” - as in estimate, roughly, not quite equal to but close enough, etc.

Granted, the symbol is in a different place to denote sarcasm, but now I’m wondering how popular the usage of ~ is in the context of sarcasm, and have I ever confused someone because they only knew this context?

Interesting.