This is a Nehebkau snake amulet. Here the snake is upraised resting on its tail with human arms extended with hands suportigng its head. Blue green glaze. Loop for suspension.
From Giza, debris of chamber of rock tomb G 7813 Z. 1931 : excavated by the Harvard University–Museum of Fine Arts Expedition; assigned to the MFA in the division of finds by the government of Egypt.
Harvard University—Boston Museum of Fine Arts Expedition