This is four Hebrew letters (Yod, He, Waw and He) called the "Tetragrammaton". The four characters are the four Hebrew letters that transliterate into English IAUE or Yahweh. Yahweh is the name of the Almighty Father in Heaven that people commonly call "The LORD" or "God". The reason we see "LORD" and "God" in our bibles is because of a Jewish tradition that the name Yahweh was not be spoken for fear that the name be blasphemed. However, this tradition does not agree with the scriptures which declare that His name be exalted! (Ps 68:4 is a good Example). The Preface of some bibles will declare why they change His name. Nearly all will cite tradition and familiarity as the reason. This, I believe is wrong. Sometimes people pronounce the tetragrammaton as Jehovah. But Jehovah could never be the right pronunciation because the Hebrew language contains no "J" or "J" sound. In EliYah's Home Page, the name of Yahweh is always used in reference to theHeavenly Father because in the scriptures we are told to praise, exalt,bless, love, teach, preach, anoint, assemble, believe, give thanks, honor and call on His name.
The Tetragrammaton has been found in the 2000 year old Dead Sea Scrolls!