F.A.B. is the codeword used in Thunderbirds, it serves a similar purpose to "10-4" or "Roger".
Many fans have tried to decipher the meaning, but unlike P.W.O.R., F.A.B. means "absolutely nothing", according to Sylvia Anderson.
However, this has not stopped fans from engineering their own meanings.
These include:
- Fully advised and briefed
- For all brothers
- Full acknowledgement of broadcast
As well as some humorous meanings, such as
- Funderbirds are brill