φεῖ
From LSJ
καὶ ἐχθροὶ τοῦ ἀνθρώπου οἱ οἰκιακοὶ αὐτοῦ → and a man's foes shall be they of his own household (Micah 7:6, Matthew 10:36)
English (LSJ)
τό, name of the letter φ, Callias ap.Ath.10.453d, Hellad. ap. Phot.Bibl.530B.; φεῖ shd. be restored for φῖ in Pl.Cra.427a, etc.; a pun on φφ
A = Φιδίς (leg. Φειδίς) in AP7.429 (Alc.).