Triangular terracotta cakes were common at most Indus sites. Earlier, some scholars proposed that they were used as toilet paper. However, since many of them have been found inside kilns and hearths, it is more likely that they were used for retaining heat during pottery firing and/or cooking. A few of the triangular cakes are incised with human figures, which has led some scholars to interpret them as objects used in fire rituals. Terracotta cakes were either triangular or round/oval and sometimes had a finger impression in the center.