Show your geek pride ! This is a large (100mm square) NPN transistor schematic symbol which is designed for a normal metal barrette to be glued to the backside.I used my Makerbot Replicator to print this part out. I then sanded it and used acetone to give it a high polish. I glued a normal metal barrette to the backside of the part and Voila ! Instant geek fashion !