33" Studio Umbrella Reflector
33" Reflective umbrella
If you haven't used one of these before, you have got to try one or two. First make sure you have some way to attach this to a light source either continuous or strobe. The way this works is you attach the umbrella (don't worry about bad luck indoors, I don't think it counts lol) to your light with the light pointing away from the subject and then the light will Bounce or reflect off the umbrella toward the subject. This is a great way to spread the light out and make it less Harsh on the subject.
Some Lights have built in places to attach umbrellas or diffusers, some don't like, say a speed light (you'll need a hot shoe mount for a speed light[check this one out]).