Floppy disk

A third generation Mazda RX-7

Familial dysautonomia

Flying Dutchman (dinghy)

Canon FD lens mount

In biology, ferredoxin, a molecule functioning in electron transfer.

full duplex on a network switch

Fidei defensor ("Defender of the faith")

The IATA code for Thai AirAsia

In the Unix operating system, file descriptor

Functional Dependency in a relation from a database

Flight director (aviation)

Imperial Japanese Army (World War II) Fortified District - a defensive fortified organization in Japanese and Manchukuo-Soviet frontier during the Pacific War period.

Free dance, the third part of an ice dancing competition

Fridays A programing block on Cartoon Network , now known as Fried Dynamite.

Fog Devils, a QMJHL team based in St. John's.

Frisky Dingo, an animated show on adult swim.

In a LARP game, it means "final death", or the end of one's character.