The D-Terminal or D-tanshi (D端子) is a type of analog video connector found on Japanese consumer electronics, typically HDTV, DVD, Blu-ray, D-VHS and HD DVD devices.
It was developed by the EIAJ (Electronic Industry Association of Japan) in its standard, RC-5237, for use in digital satellite broadcast tuners.
A D-Terminal connector carries a component video signal (YPBPR).
A device with a D5 connector can understand and display the following video signals: A device with a D-Terminal connector supports that level and lower D-Terminal signal.
[1] It is not always a given that output devices support all lower versions of the standard, so customers must take care to buy compatible products.