Shemhamphorasch

The Shemhamphorasch is a corruption of the Hebrew term Shem ha-Mephorash (שם המפורש) ("the explicit Name ", that is, the full and proper name, and not a filler term or cipher, which are used in conversation and prayer), which was used in tannaitic times to refer to the Tetragrammaton. In early Kabbalah, the term was used to designate sometimes a 72-letter name for God, and sometimes a 42-letter name. Rashi said Shem ha-Mephorash was used for a 42-letter name, but Maimonides thought Shem ha-Mephorash was used only for the four letter Tetragrammaton.