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A hand symbol used by the suspect in the New Zealand Mosque shooting in his first appearance in court has been added to a database of gestures considered to be racist.

The Anti-Defamation League (ADL), a Jewish non-governmental organisation based in New York City, has also added the bowlcut hairstyle worn by American white supremacist and mass murderer Dylann Roof to its list, among a number of other "new symbols, memes and slogans".

In a statement, the CEO of ADL, Jonathan Greenblatt, said: “Even as extremists continue to use symbols that may be years or decades old, they regularly create new symbols, memes and slogans to express their hateful sentiments.

“We believe law enforcement and the public needs to be fully informed about the meaning of these images, which can serve as a first warning sign to the presence of haters in a community or school.”

In total there are 36 new entries to the online resource of hate symbols.

(Image: Getty Images) (Image: AFP/Getty Images)

In a statement, an ADL spokesman said a number of the new entries "include white supremacist symbols adopted in recent years by the alt right segment of the white supremacist movement."

The ADL highlights that they have added the 'Moon Man', the 'Happy Merchant' and "logos for a number of new white supremacist groups" to their database.

Scroll down for explanations of some of the symbols which have been added to the database.

The ADL says their online database "provides explanations for many of the symbols, memes and slogans most frequently used by a variety of white supremacist and other hate groups."

(Image: Getty Images)

Mark Pitcavage, of ADL’s Center on Extremism, said: “These are the latest calling cards of hate.

“While some hate symbols are short-lived, others take on a life of their own and become tools for online trolling.

"We pay special attention to those symbols that exhibit staying power as well as those that move from online usage into the real world.”

Such symbols, the organisation says, have appeared at white supremacist events such as the 'Unite the Right' rally in Charlottesville and were "painted on the guns" allegedly used by the suspect in the Christchurch mosque shootings in New Zealand, Brenton Tarrant.

The ADL spokesman added: "These slogans and symbols also frequently appear online in venues such as 4chan, 8chan and Reddit.

"Some have also spread into other more popular mainstream platforms such as Twitter and Facebook , or gaming platforms.

"A July 2019 ADL survey found that nearly one-quarter (23 percent) of all online gamers have been exposed to white supremacist ideology while gaming.

"Some of the slogans, such as the phrase, 'It’s Okay to be White,' have recently appeared in white supremacist fliering campaigns both on and off campus.

"During the 2018-2019 academic year, ADL documented 313 cases of white supremacist propaganda on campus, a 7 percent increase from the prior year."

ADL explains some of the newly added symbols, slogans and memes

The 'OK' hand symbol – Begun as a hoax by members of the website 4chan, the OK symbol became a popular trolling tactic. By 2019, the symbol was being used in some circles as a sincere expression of white supremacy. Australian Brenton Tarrant flashed the symbol during his March 2019 courtroom appearance soon after his arrest for allegedly murdering 50 people in mosques in Christchurch.

The 'Moon Man' is an Internet meme originally popularized on the now-defunct Internet forum You’re the Man Now Dog. The forum appropriated the 1980s McDonald’s restaurant chain mascot 'Mac Tonight,' which featured a smiling crescent moon image wearing sunglasses. In the 2000s, internet users began to create GIFs and videos of Mac Tonight, which they called 'Moon Man,' typically coupled with violent or racist rap songs using computer-generated voices. By 2015, the Moon Man meme spread to other forums such as 4chan and 8chan, where it became associated with alt right language and imagery, including explicit white supremacist imagery. For a time, hundreds of offensive 'Moon Man' songs existed online.

Burning Neo-Nazi symbols – Neo-Nazis have adopted the Ku Klux Klan practice of symbolic burnings, substituting swastikas and other neo-Nazi symbols such as othala and life runes, for crosses.

Dylann Roof’s 'Bowlcut' – The 'Bowlcut' is an image of a bowl-shaped haircut resembling the one worn by white supremacist mass killer Dylann Roof. It is claimed that those who use the bowlcut image or other “bowl” references admire Roof and call for others to emulate his 2015 mass shooting attack at Emanuel AME Church in Charleston, South Carolina.

Happy Merchant – An anti-Semitic meme depicting a drawing of a Jewish man with heavily stereotyped facial features who is greedily rubbing his hands together. The meme is by far the most popular anti-Semitic meme among white supremacists.

'Anudda Shoah' – An anti-Semitic phrase that first became popular among white supremacists in 2014 to mock Jews, whom they claim bring up the Holocaust ('Shoah' is the Hebrew term for Holocaust) when confronted with anything they don’t like.

Diversity = White Genocide – A white supremacist slogan intended to suggest multiculturalism will mean the demise of the white race.

Logos of various hate groups, including the neo-Confederate white supremacist League of the South; the neo-Nazi National Socialist Legion; the white supremacist Rise Above Movement (RAM); the white supremacist group Patriot Front; and the American Identity Movement, the white supremacist group that is successor to Identity Evropa.

The ADL spokesman added: "ADL founded the Hate on Display hate symbols database in 2000 as part of its effort to track hate groups and help law enforcement, educators and other members of the public recognize symbols that serve as a potential warning of the presence of extremists and anti-Semites.

"A print version of the resource, in brochure form, will be distributed to local law enforcement and made available to school districts across the country."