Nikon D3 - Manual (Page 230)

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Flash Contacts
The camera is equipped with an accessory shoe for attaching
optional flash units directly to the camera and a sync terminal that
allows flash units to be connected via a sync cable. When an
optional flash unit is attached, the flash will fire whenever the
shutter is released.
❚❚The Accessory Shoe
Use the accessory shoe to mount optional
flash units directly on the camera without a
sync cable (pg. 191). The accessory shoe is
equipped with a safety lock for Speedlights
with a locking pin, such as the SB-800, SB-600,
and SB-400.
❚❚The Sync Terminal
A sync cable can be connected to the sync
terminal as required. Do not connect
another flash unit via a sync cable when
performing rear-curtain sync flash
photography with a flash unit mounted on
the camera accessory shoe.