Borderline non-geek question sent in by Abhishek Upadhya. Thanks a ton dude!

What is 1? (teh rest of the images are hints)

Cracked by: Logik, udupendra, shrik, Dibyo, Rogi, AmK, Ananth, Raghuvansh, Debasish, nishansolo, Kaustuba, Kaustuba and Rithwik k