Sarcasm punctuation mark aims to put an end to email confusion - Telegraph Paul Sak of the firm said that the new punctuation mark was not a gimmick and had serious potential applications, such as allowing deaf people to pick up sarcasm in subtitles. The symbol currently costs $1.99 to download – a price that many may think deserves a SarcMark of its own.
Sarcasm punctuation mark aims to put an end to email confusion - Telegraph

Paul Sak of the firm said that the new punctuation mark was not a gimmick and had serious potential applications, such as allowing deaf people to pick up sarcasm in subtitles.

The symbol currently costs $1.99 to download – a price that many may think deserves a SarcMark of its own.