NOTEWhen each of the four constituent letters of the holy name of Havayah is spelled out in full (מלא, maleh), the resulting holy name is known as an “expansion” (מילוי, milui, literally a “filling”) of the root name. The “filling” of the letter Yud is constant (יוד, YUD), but the letter Heh may be “filled” either with a Yud (הי, HeY) or an Aleph (הא, HeA) or a Heh (הה. HeH), while the letter Vav may be spelled in full either with a Yud (ויו, VIV) or an Aleph (ואו, VAV), or with neither (וו, VV).
Different spellings of the four root letters of the name produce different “expansions” each having its own characteristic numerical sum (גימטריא, Gematria). The four main expansions of HaVaYaH take their names from their gematrias:All the various kinds of functions found in the Sefirot are without exception governed under the order of the ten Sefirot, which is the order of the four letters of the Name, blessed be He.
And this is the order that governs the musical notes, vowel signs, crowns and letters through the four letters and the four names contained in each one of them.