This is a common literary device used by Snicket to create mystery and intrigue. He never explicitly reveals the full meaning of VFD, leading readers to speculate and decipher clues throughout the series.
However, we know a few things about VFD:
* It's a secret organization: Members of VFD are involved in a dangerous and ongoing conflict.
* It's related to knowledge and books: VFD seems to be connected to the preservation of knowledge and the fight against censorship.
* It's full of secrets and symbolism: Many clues and symbols are associated with VFD, making it a constant source of mystery.
Ultimately, the exact meaning of VFD remains a mystery, but it's a crucial element in the narrative of "A Series of Unfortunate Events." Snicket encourages readers to actively engage with the story and try to understand the organization's purpose and its connection to the Baudelaire orphans' fate.