This is a Y connector. It has a male plug on one end with female pins, then Ys out to two female plugs with male pins. Perfect for having your RC receiver power/control two servos or motor speed controllers from one channel.
This compact module packs three IR LED/phototransistor pairs onto a 1.25″ × 0.3″ board. The sensors are mounted on a 0.375″ pitch, making this array a great minimal sensing solution for a line-following robot.