They’re the four letters showing up all over social media after the death of handcuffed black man George Floyd at the hands of a white police officer.
But if you look closely you’ll see them everywhere that there are protests.
In the city of Denver on Sunday a woman was photographed at an anti-police rally with the letters “ACAB” painted under her left eye.
On a van window in the city of Detroit on Sunday the same four letters were painted on a sign that read in full: “Bad cop no donut! ACAB.”
The acronym means “All Cops Are Bastards” and is often interchanged with the numbers “1312”.
As Americans document the uprising in cities across the country, ACAB is being shared far and wide — so much so that it was trending on Google on Monday.
George Floyd died nearly a week ago in hospital after pleading for air on the side of the road as an officer pressed a knee into his neck for almost 10 minutes.
Tens of thousands of protesters took to the streets across America every day after the footage was released and again on Sunday, with peaceful demonstrations against police killings of black people overshadowed by unrest that ravaged cities from Philadelphia to Los Angeles and flared near the White House.
City and state officials deployed thousands of National Guard soldiers, enacted strict curfews and shut down mass transit systems to slow protesters’ movements, but that did little to stop parts of many cities from again erupting into mayhem.
Protesters in Philadelphia hurled rocks and Molotov cocktails at police, officials said, while thieves in more than 20 California cities smashed their way into businesses and ran off with as much as they could carry — boxes of sneakers, armloads of clothes, and mobile phones, TVs and other electronics.
In Minneapolis, a tanker truck driver drove into a massive crowd of demonstrators. No protesters appeared to be injured, and the driver was arrested.
Tensions spiked outside the White House, the scene of three days of demonstrations, where police fired tear gas and stun grenades into a crowd of more than 1000 chanting protesters across the street in Lafayette Park.
The crowd ran away and piled up road signs and plastic barriers to light a raging fire in a nearby street. Some pulled an American flag from a building and threw it into the blaze.
As the protests grew, President Donald Trump retweeted conservative commentator Buck Sexton who called for “overwhelming force” against violent demonstrators.
Secret Service agents had rushed Trump to a White House bunker on Friday night as hundreds of protesters gathered outside the executive mansion, some of them throwing rocks and tugging at police barricades.
The president spent nearly an hour in the bunker designed for use in emergencies like terrorist attacks, according to a Republican close to the White House who was not authorised to publicly discuss private matters and spoke on condition of anonymity.
The account was confirmed by an administration official who also spoke on condition of anonymity.
— with AP