Triple parentheses
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Triple parentheses or triple brackets, also referred to as an echo (stylized as (((echo)))), are an antisemitic symbol and orthotypographical convention. The symbol has been used online by antisemites to mark individuals or organizations perceived as Jews as targets for online harassment and doxxing.
This use of the symbol originated from the alt-right-affiliated, neo-Nazi blog The Right Stuff, whose editors said that the symbol refers to the historic actions of Jews which have caused their surnames to "echo throughout history". The triple parentheses have been adopted as an online stigma by antisemites, neo-Nazis, browsers of the "Politically Incorrect" board on 4chan, and white nationalists to identify individuals of Jewish background as targets for online harassment, such as Jewish political journalists critical of Donald Trump during his 2016 election campaign.
Use of the notation was brought to mainstream attention by an article posted by Mic in June 2016. The reports also led Google to remove a browser extension meant to automatically place the "echo" notation around Jewish names on web pages, named "Coincidence Detector", and the notation being classified as a form of hate speech by the Anti-Defamation League. In the wake of these actions, some users, both Jews and non-Jews, have intentionally placed their own names within triple parentheses as an act of reappropriation or solidarity.
Prior to its use as an antisemitic label or identifier, ((( screen name ))) had been used in online communities such as AOL to indicate that a user was "cyberhugging" the user with the specified screen name.