It is an Infrared distance made by Sharp, you can see this sensor used in many hobbist projects. I got one in my electronic bag, but still not yet have a test. Robotroom website got a quite good measurement on the GP2D12 analog voltage against the distance, it may be a good reference if you are going to work on GP2D12. Another good reference is from uCHobby, they connect a GP2D12 with servo and visualize the measuring in radar like pattern with "Processing", source codes are provided as well:)
Links:
RobotRoom:GP2D12 Distance Measurement Detector
Visualizing Sensor Data with Arduino and Processing
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