The raised arm salute has become an unofficial symbol of opposition to Thailand's May 22 coup, and a creative response to several bans the ruling junta has placed on freedom of expression.
"At this point we are monitoring the movement," said Col. Weerachon Sukhondhapatipak, a spokesman for the junta. "If it is an obvious form of resistance, then we have to control it so it doesn't cause any disorder in the country."
On Sunday, authorities deployed nearly 6,000 soldiers and police in Bangkok to prevent planned protests against the coup. Amid the heavy security, small flash mobs popped up in a central shopping district where the salute was unveiled for the first time.
Asked what the symbol meant, protesters have given varying explanations. Some say it stands for the French Revolution's trinity of values: liberty, equality, fraternity. Others say it means freedom, election and democracy. A photo montage circulating online paired a picture from the science fiction blockbuster "The Hunger Games" with a graphic of three fingers labelled, 1. No Coup, 2. Liberty, 3. Democracy.
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"We know it comes from the movie, and let's say it represents resistance against the authorities," Weerachon said, noting that if authorities encounter the salute they will first ask protesters to stop.
"If a single individual raises three fingers in the air, we are not going to arrest him or her," he told The Associated Press. "But if it is a political gathering of five people or more, then we will have to take some action."
Social activist Sombat Boonngam-anong, who has helped organise anti-coup protests, posted an explanation of the salute on his Facebook page along with a call to step up the silent acts of defiance.
"Raising three fingers has become a symbol in calling for fundamental political rights," wrote Sombat, a member of the "Red Shirt" protest movement that had backed the now-ousted government and warned it would take action if there was a coup.