From Nikon Hacker
- AF - Auto Focus
- CCD - Charge Coupled Device. Often used generically to mean "Image Sensor", even in CMOS-based cameras.
- PCB - Printed Circuit Board
- SB - ??? - Means Flash / Speed Light in docs
- SI - ??? - Means viewfinder in docs
- TFT - Thin Film Transistor. A type of LCD display. Used generically to mean "LCD Screen" in documentation.