|Source Mod||RedPower 2|
The OR Gate is one of numerous blocks from RedPower 2 that allows for compact Redstone wiring. The OR Gate has three input faces and one output face. If the OR Gate is receiving power from at least one of its input faces, then it will output a Redstone signal from its output face. This allows for many different power sources to power the same thing without need for complex and space-needing Redstone wiring.