Epsilon
From Textus Receptus
Ε ε Epsilon is the fifth letter of the Greek alphabet, corresponding phonetically to a close-mid front unrounded vowel /e/. It is also the primary letter used in Real Analysis. In the system of Greek numerals it has a value of 5. It was derived from the Phoenician letter He. Letters that arose from Epsilon include the Roman E and Cyrillic Ye.
"Epsilon" (ἒ ψιλόν, "simple e") was coined in the Middle Ages to distinguish the letter from the diphthong αι, which started being pronounced the same way during the period of New Testament Greek.
