Many are familiar with the so-called gamma marks as they are portrayed on early medieval mosaics in Ravenna and Rome. They appear as right-angle marks, usually with toothed ends, or in a shape like a capital H on the corners of angels’ and worthies’ robes in mosaics depicting textiles such as altar cloths and hangings. The marks defy easy explanation, in part because they are also portrayed in multiple cultural contexts, well beyond Italy, and because they take other forms. This paper surveys publications from Maciej Szymaszek, one of three scholars whose recent works significantly increase our knowledge of the marks’ geographic spread, their frequency of use, and their persistence across time.