Noun
An instrument consisting of a thin metal frame, through which passed a number of metal rods, and furnished with a handle by which it was shaken and made to rattle. It was peculiarly Egyptian, and used especially in the worship of Isis. It is still used in Nubia.
Source: Webster's dictionaryIn the New Kingdom, the Egyptians played on bells, cymbals, tambourines, drums, and imported lutes and lyres from Asia. citation The sistrum was a rattle-like musical instrument that was especially important in religious ceremonies. Source: Internet
The goddess Bast sometimes was depicted holding a ceremonial sistrum in one hand and an aegis in the other – the aegis usually resembling a collar or gorget embellished with a lioness head. Source: Internet