Pneumatic Actuator

It may depend on context.

For example, suppose the actuator operates a valve for filling a tank. You might then command the actuator to open at tank level of 20% and close at tank level of 90%.

On the other hand, if you are verifying the actuator position, say with an encoder that ranges from 0 to 100%, your logic might be actuator open at 95% of travel, actuator closed at 2% of travel.