rouelle

thin, round object or slice; steak (especially of veal, cut across the leg); rouelle (a round badge that Jews were legally obligated to wear in public)

“Quelques Juifs, serrés en groupes timides, la rouelle jaune sur leur manteau, étaient venus regarder ce supplice dont, pour une fois, ils ne faisaient pas les frais.” — Some Jews, huddled in timid little groups, the yellow rouelle on their coats, had come to watch this act of torment which, for once, was not being inflicted on them.

Inherited from Old French roïele, roel, rodele, from Late Latin rotella, diminutive of Latin rota (“wheel”).