alpha omega

http://www.newadvent.org/cathen/01332a.htm

1:1. The Revelation of Jesus Christ, which God gave unto him, to make known to his servants the things which must shortly come to pass: and signified, sending by his angel to his servant John,
Apocalypsis Iesu Christi quam dedit illi Deus palam facere servis suis quae oportet fieri cito et significavit mittens per angelum suum servo suo Iohanni .

Alpha and Omega (Gr. "το 'Αλφα και το Ω") is an appellation of God in the book of Revelation (verses 1:8, 21:6, and 22:13). Its meaning is found in the fact that Alpha (Α) and Omega (Ω) are respectively the first and last letters of the Greek alphabet. This would be similar to referring to someone in English as "the A to Z". Thus, twice when the title appears it is further clarified with the additional title "the Beginning and the End" (21:6, 22:13).
Revelation 1: 11 in the King James Version says, “I am Alpha and Omega, the first and the last.” This verse clearly proves an undisputed reference to Jesus as the “Alpha and Omega”. However, this additional occurrence of this phrase does not receive support from some of the oldest Greek manuscripts, including the Alexandrine, Sinaitic, and Codex Ephraemi Rescriptus. It is, therefore, omitted in many modern translations. Scholar Robert Young stated that the “oldest MSS. omit” it. [1]

This phrase is interpreted by many Christians to mean that Jesus existed from the beginning of time (as the second person of the Trinity), and will exist eternally.
Emet (אמת), literally "truth", one of the names of God in Judaism, has been interpreted as consisting of the first, middle and final letters of the Hebrew alphabet.

http://en.wikipedia.org/wiki/Hebrew_alphabet

This article is mainly about Hebrew letters. For Hebrew diacritical marks, see niqqud (for the vowel points) and cantillation.
The Hebrew alphabet (Hebrew: אָלֶף-בֵּית עִבְרִי‎ [1], alefbet ’ivri) consists of 22 letters used for writing the Hebrew language. Five of these letters have a different form when appearing as the last letter in a word. The Hebrew letters are used in mildly adapted forms for writing several languages of the Jewish diaspora, most famously Yiddish, Ladino, and Judeo-Arabic (for a full and detailed list, see Jewish languages). Hebrew is written from right to left.

http://www.newadvent.org/cathen/01332a.htm

Alpha and Omega are the first and the last letters, respectively, of the Greek alphabet. They have been employed from the fourth century as a symbol expressing the confidence of orthodox Christians in the scriptural proofs of Our Lord's divinity. This symbol was suggested by the Apocalypse, where Christ, as well as the Father, is "the First and the Last" (2:8); "the Alpha and Omegain Scripture), the first and the last, the beginning and the end" (cf., 22:13; 1:8). Clement of Alexandria speaks of the Word as "the Alpha and the Omega of Whom alone the end becomes beginning, and ends again at the original beginning without any break" (Strom., IV, 25). Tertullian also alludes to Christ as the Alpha and Omegain Scripture) (De Monogamiâ, v), and from Prudentius (Cathemer., ix, 10) we learn that in the fourth century the interpretation of the apocalyptic letters was still the same: "Alpha et Omega cognominatus, ipse fons et clausula, Omnium quae sunt, fuerunt, quaeque post futura sunt." It was, however, in the monuments of early Christianity that the symbolic Alpha and Omegain Scripture) had their greatest vogue. The earliest date at which this symbol occurs is in the year 295, in a dated inscription of Rome. In this example, however, it is to be noted that the Omega takes precedence, and that both letters form part of the inscription, thus: