Nikon D90 - Manual (Page 258)

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Flash Contacts
The D90 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.
❚❚The Accessory Shoe
Use the accessory shoe to mount optional flash units directly
on the camera without a sync cable (pg. 234). The accessory
shoe is equipped with a safety lock for Speedlights with a
locking pin, such as the SB-900, SB-800, SB-600 and SB-400.
A The AS-15 Accessory Shoe Adapter
When the AS-15 accessory shoe adapter (available separately) is mounted on the camera
accessory shoe, flash accessories can be connected via a sync cable.
Accessory shoe