He's Iron Man. The Golden Avenger. Shellhead. But most importantly, he's Tony Stark, one of the greatest minds of his generation.
The Iron Man chest plate has been of special importance to Tony Stark ever since he first donned his armor. Originally structured to keep his injured heart beating through the use of a magnetic-field generator, the chest piece was soon adapted to serve as one of the many offensive tools Iron Man's arsenal. While he no longer needs the armor to keep himself alive, Iron Man frequently relies on his chest plate's powerful unibeam in battle.
Capable of firing a blast similar to that of his repulsors, the unibeam can also function as a searchlight able to project in nearly every spectrum, even infrared and ultraviolet. The unibeam can aslo produce a local electro-magnetic pulse, a laser beam, holographic images, and a wavelength scanner.