Z, z, was perhaps a letter of the original Latin alphabet, since it is found in the Carmen Saliare,
s , as in Saguntum for Ζάκυνθος, Sethus, sona, etc.; and by ss when medial, as in Atticisso, badissas, etc., in Plautus. It seems to have been sounded like the Engl. z (Corss. Ausspr. 1, p. 295; but cf. Roby, Gr. 1, § 195). In late Latin writings z is very frequent in place of s , and in the words Zmyrna for Smyrna, zmaragdus for smaragdus, is found in the best MSS. In writings of the third and fourth Christian centuries z often stands for initial di before a vowel, as zaconus, zabulus, etc.; cf. the Aeolic ζά for διά.