Isis is the archetypal mother giving birth to Horus. Her emblem is a throne. For some barely understandable reasons Isis is confused with Isis-Hathor in numerous museum examples, including in the British Museum, the MET and Le Louvre. Position on mummies: upper torso. Highly common amulets of Isis were made in various materials since the New Kingdom, Ramesside Period
References
1Andrews C. Amulets of Ancient Egypt 1994, p. 48 and Fig. 52a
2For a close parallel see LDUCE-UC #22588





