This is proprietary (non-standard, product specific ) connector. A proprietary connector is the special connector that can only be used with a certain device(s).
This is the 8 pin Nikon mini-USB proprietary connector
- Fujifilm Finepix JV250, F80EXR, F85EXR USB cable pinout
- Nikon D90, D3100, D3200, D3300, D5000, D7000 focus / shutter MC-DC2 connector pinout