13.5V constant ouput OR regular voltage regulator???

According to everything i can find describing this regulator, it is a contant output at 13.5 volts. Constant. Constant voltage. Constant at 13.5 volts. Constantly constant. Consistently constantly constant. Constant, that is, at 13.5 volts. That's constant, that is. At 13.5 volts, constant.