We've placed all tactile feedback devices together as "haptic displays." Devices in this category vary in sophistication and complexity. The simplest are open cycle haptics, which includes such devices as rumble packs and other devices that cause players' controllers to shake or vibrate.
Closed cycle haptics are devices that take haptic input and simultaneously give haptic output. These devices differ from open cycle haptics in that the same device receives input and provides output. When a racing game's steering wheel resists being turned to represent a car's momentum fighting against a turn is a simple example of a closed cycle haptic interface.