The upside-down smiley emoji tends to be used in a sarcastic sense. The emoji is a flipped version of the usual smile face which is one of the most used emoticons.

Ellie York, 23, agrees with Bishi, telling The Independent that “there is definitely a more sinister passive-aggressive or sarcastic side” to the smiley emoji. “I think it’s the eyes.

No need to drop smiley faces and "j/k"s in e-mails to indicate a jocular manner. Behold - the SarcMark.