Minecraft wiki entry for Memory, associated text: T flip-flops are also known as "toggles". Whenever T changes from OFF to ON, the output will toggle its state. A useful way to use T flip-flops in Minecraft could, for example, be a button connected to the input. When players press the button the output toggles (a door opens or closes), and does not toggle back when the button pops out. These are also the core of all binary counters and clocks, as they function as a "period doubler", releasing one pulse for every two received.