The letter H of Malchut is built from three lines that represent the three columns revealed in it.
The lines like three Vavs are numerically 18 for the 18 blessings in the standing and silent prayer. The blessings come from Binah through Zeir Anpin to the head of Yessod, which is a Tzaddik, to Malchut.
Vav is in the middle between the two H (HVH) and it representse the measurement of cubit in the building of the Tabernacle.
Exodus 26:16 “Ten cubits shall be the length of the board…”.
Board is קרש with value of 600. The letters קרש are the last of the Alef Bet just before the Tav (400) that represents Malchut.
Cubit is actually a measurment of light revealed in the Tabernacle, connecting the Light Y and H with the V to H Malchut.
All measurements and counts in the Torah represent different revelations of light.