1.  Zēta is the sixth letter in the Greek alphabet.

2.  Zēta is a continuant [compound] consonant. Its phoneme is formed when the passage of air is restricted--but not stopped--causing friction while the sound continues.

3.  Zēta's phoneme is a combination of d + [unvoiced] s, OR d + [voiced] s. Thus, two sounds are associated with Zta. Zēta is unvoiced when it begins a word and sounds like the "z" as in "gaze." If the letter's position is anywhere else in a word (medial or final), its phoneme sounds like dz as in "adz."

4.  Zēta is transliterated into English as "Z" or "z."