Signs and T-shirts emblazoned with some variation of the letter Q dotted a rally for Donald Trump in Tampa on Tuesday. Paper printouts declaring “We are Q” occupied small sections of the crowd.

One rally-goer named Tyler held out a large coin with Q on it and explained the letter’s sudden prevalence among Trump supporters. “Qanon, the storm, the great awakening,” he told local TV station WPLG.

“What Q stands for is military intelligence, most likely. He’s been talking to all of us. Letting us know the covert battles that are waging between the Deep State and President Trump.”

Tyler, whose last name was not disclosed to WPLG, is one of a growing number of vocal followers of a conspiracy theory, known as Qanon, that has taken hold among some Trump supporters. The theory centers around an anonymous source, Q, who is trying to tell the world about a secret battle being waged by Trump and special counsel Robert Mueller against a pedophile ring filled with celebrities and political elites who have been covertly running the United States government for decades.