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If you are referring to computers, it is a 6pin power connector for modern Video cards. Most new video cards require at least 1 P12 connector, some require 2 P12 connectors.
db9
It connects the drive to the system power supply.
P1
the regular ATX has a 20 pin power connector, while the enhanced ATX power connector has 24 pin power connector.
The P1 power connector is the first ATX power supplies and motherboards used a single power connector. It also has 20 pins.
Power input connector, or just power connector
Power input connector, or just power connector
8-pin power supply connector with 150 watts
8-pin power connector and 300 watts
8-pin power supply connector, 150watts
Automotive : negative ( ground ) side Household : common ( hot ) side