The phallus amulet was intended for the magical preservation of virility1. Materials include faience, glass, gold, etc. These amulets are unique to the Graeco-Roman Period and there is no evidence that Egyptians actually used them2

Multicoloured glass
pierced for suspension
H 2.8 Graeco-Roman Period
Bonhams Antiquities
lot 218, 28 April 2010

Flat back blue-green glaze with suspension loop
H 1.6, W 0.9, T 0.7
Graeco-Roman Period
© 2017 University
College London
LDUCE-UC #38475

Gold H 2.3
Roman Period
Art market

References

1Andrews C. Amulets of ancient Egypt, 1994, p. 71
2Petrie W F M. Amulets, 1914, p. 11 and Figs. 16a-d