The personal accident rider is also known as double indemnity rider. (policybazaar.com)
The accidental death or double indemnity rider pays the beneficiaries twice the face value of a life insurance policy in the event the insured dies as the result of an accident. (bestliferates.org)
Sometimes referred to as double indemnity riders / policies, the payout may be double the face amount of the death benefit. (protective.com)