Hey, Vav, Hey!
Dizzyhead Joshua writes:
26 is the Kabbalistic equivalent of the name of God. If you play the game of "gematria," that is, the assignation of numerical worth to Hebrew letters: Aleph equals 1, Bet equals 2, etc.
The name of God is YHWH: Yod, Hey, Vav, Hey.
Yod is the tenth letter of the alphabet, its numerical value is 10.
Hey is the fifth letter, for a value of 5.
Vav is the sixth letter, for a value of 6.
Hey, again, for 5.
Abraham Abulafia, 13th century mystic, wrote much about this.