Leveling one of the strangest allegations yet in the ongoing purge aftermath of the failed July 15 coup, Turkish authorities have either detained/arrested or dismissed from their jobs hundreds of individuals across Turkey, citing $1 bills as evidence that people are followers of Fethullah Gülen, a Turkish scholar whom the gov’t accuses of orchestrating the coup.

Turkish authorities have so far come up with many different theories regarding the $1 bills that come out of people’s pockets. According to one theory, the letters at the start of the banknotes’ serial numbers correspond to ranks in the movement.

For instance, the letter “F” indicates a high-ranking soldier or police chief, while J and C represent low-ranking soldiers. B is for students, while E and S are for instructors and academics in Gülenist schools.

Turkey’s Justice Minister Bekir Bozdag is among those authorities who are convinced that the $1 bill is a clear indication of membership in the Gülen movement. In one of his recent interviews with the pro-gov’t A Haber television channel, he said, “There is no doubt that this $1 bill has some important function within the Gülenist terror organization.”

Recently speaking to The Associated Press, a senior government official also said Turkish authorities are sure that these specific $1 bills were being used to send “secret” messages or designate the rank of the holder.

“Multiple people questioned over involvement in the military coup of July 15 told prosecutors they received $1 bills from superiors within the Gülen movement. They were told that Fethullah Gülen himself had blessed the banknotes,” the official said, who spoke on condition of anonymity because he was not authorized to discuss the matter publicly.