Vav = 6, ordinal 6, reduced 6, no final form. Spelled in full, ויו = 6+10+6 = 22, or וו = 12.
Meaning
Vav is 'nail' or 'hook', one of the twelve simples, and the letter of conjunction — the 'and' that joins words, which the tradition reads as the letter's office: the hook that holds heaven and earth together. Its 6 is the number of the six days of work and of the six directions of space, and vav is the sixth sefirah's letter, Tiphareth.