Nikon D750 DSLR Camera (Body Only) - Manual (Page 231)

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Choose the number of shots.
Pressing the D button, rotate the main command dial to
choose the number of shots in the bracketing sequence. The
number of shots is shown in the information display and
control panel.
At settings other than zero, a M icon
is displayed in the control panel.
D appears in the viewfinder, while the information display
provides a bracketing indicator and an icon showing the type
of bracketing:
v (exposure and flash bracketing), w
(exposure bracketing only), or x (flash bracketing only).
Number of shots
D button Main command
dial
Exposure and flash bracketing
indicator
Information display