The three-finger salute from the Hollywood movie The Hunger Games is being used as a symbol of resistance in Thailand.
Protesters against the military coup are flashing the gesture as a silent act of rebellion, and they're being threatened with arrest if they ignore warnings to stop.
Thailand's military rulers say they are monitoring the new form of opposition.
"Raising three fingers has become a symbol in calling for fundamental political rights," said anti-coup activist Sombat Boonngam-anong on his Facebook page.
The gesture emerged over the weekend as protesters joined small flash mobs, or stood alone, flashing three fingers in the air.
In The Hunger Games movie series and book trilogy, the salute symbolises rebellion against totalitarian rule, signifying thanks, admiration and goodbye to a loved one.
The Hunger Games films have been popular in Thailand, but not unusually so.
A spokesman for the film distributor Lionsgate said the company was aware of the Thai protest but had no comment.