HaShem

השם

HaShem- a Hebrew word meaning "The Name".  Just as Christian Bibles often use "LORD" as a reverential circumlocation for the four letter name of G-d, Hebrew texts use the term "HaShem" to express the Name.  Although literally pronounced as described below, during prayers the word "Adonai" (Lord) is said in its place.  Sometimes seen as Hashem.  Strong''s #8034.  Pronounced hah SHEM.

see http://www.ou.org/about/judaism/di.htm#hashem