Nikon N6006 - Manual (Page 161)

ISO film speed
The international standard for representing film sensitivity
(speed with which it reacts to light). The higher the number, the
greater the sensitivity, and vice versa. A film speed of ISO 200
is hvice as fast as IS0100, and half the speed of ISO 400 film.
LCD
Liquid Crystal Display. For the N6006, used on the panel on
top of camera body and inside viewfinder.
Manual flash
Flash output is fixed in manual flash mode, while flash output
power varies according to selected aperture in auto flash
mode. Some Speedlights including SB-20 and SB-24 provide
selectable manual output (full, 1/2,1/4,1/8,1/16, etc.) and some
provide full output only.
Matrix metering system
An advanced camera light metering system using a multi­
segment sensor and computer; available in Nikon SLR models
F-601/N6006, F-601M/N6000, F4 and F-801/N8008. A basic
version is used with the Nikon F401/N4004 and F401s/N4004s
models. Matrix metering is an exclusive Nikon feature.
Non-TTL auto flash
A sensor measures illumination without viewing through
camera’s lens.