Ann Coulter posted a very simply tweet Thursday, reading only, "14!" It quickly excited neo-Nazis accounts on Twitter, however, because the number is a popular white supremacist code word.

Neo-Nazis often use the number 14 as a reference to the so-called 14 words, which the Anti-Defamation League (ADL) calls "the most popular white supremacist slogan in the world." Those 14 words are, "We must secure the existence of our people and a future for white children."

Some of Twitter were quick to point out 14 is a common Neo Nazi phrase. Others pointed out Coulter could be referencing the days until President-elect Donald Trump's inauguration, which is actually 15 days days away. But President Barack Obama does have just 14 full days left in office, Mic pointed out

The 14-word slogan was originated by David Lane, a member of a white supremacist group called The Order. Lane died in prison in 2007.

"Because of its widespread popularity, white supremacists reference this slogan constantly, in its full form as well as in abbreviated versions such as '14 Words', 'Fourteen Words,' or simply the number '14,'" the ADL's website states.

A number of Twitter users responded to Coulter's tweet by simply typing out the 14-word slogan. Others responded with "88," another white supremacist code. It stands for "Heil Hitler" — H is the eighth letter in the alphabet — and is often combined with 14 to spell out further white supremacist messages, according to the ADL. Eighty-eight can also represent Lane's "88 Precepts," which dictated what he considered to be "natural law," according to the Huffington Post.

Coulter is a conservative figure who has written a number of controversial books, including 2016's "In Trump We Trust: E Pluribus Awesome!" and 2015's "Adios, America: The Left’s Plan to Turn Our Country Into a Third World Hellhole."

The Southern Poverty Law Center (SPLC) wrote a post in December calling Coulter an "infamous far-right attack dog," while noting she had attended a holiday party hosted by the website VDARE, which the SPLC has deemed a white supremacist site.