The letter Vav of the YHVH name represents the central column and the light that comes to Malchut. Vav is Zeir Anpin that is like the Sun that brings the light to the Moon, which is the aspect of Malchut.
Because this light can shine its light without dependency on other elements, negativity can not influence judgment until this light is concealed. That is why the negative side is stronger at night.
(The sun produces the light / energy from itself. The moon needs the light of the sun to share before it can be revealed. The dark side of the moon doesn’t have light of its own or even the ability to share because it has nothing and therefore it is dark.)
Our sharing work is like producing pure light, like the sun. While we are continuously engaged with sharing, negativity can not have a hold on us. When we stop sharing, we make an opening for negativity to come. This is why it is important to share from all our God given gifts, small or big. It would be better to give every week a portion of our monthly giving than giving it all once a month. Frequent giving and sharing give us better connection on Shabbat that reveals new energy in the world. Keeping the flow of light of sharing pushes away negativity from our lives.
The Zohar reveals that in the book of Adam the letter ו Vav has the form of one dot at the top and five dots below. The top dot represents the Y י of the YHVH name and the five dots below it represent the upper ה H of the name.
That means that the Vav ו includes in it the upper two letters י Y and ה H .
The Vav serves as a bridge between the upper and lower world as it is revealed in the letter א Alef.
The upper Yod and Vav in the middle are the upper world and the Vav and the lower Yod are for the lower world.
Yod is numerically 10 so the Alef is Yod + Vav + Yod = 26.
When the Vav is split for the two worlds we have Yod + Vav + Vav + Yod = 32. The force of the Alef is revealed in the mouth through the 32 teeth, 16 above and 16 below.
Daily Zohar # 1756 – Tetzaveh – The sun and the moon