Preferred stock which confers rights to prior periods' unpaid dividends even if they were not declared is called:

Preferred stock which confers rights to prior periods' unpaid dividends even if they were not declared is called: Cumulative preferred stock
In cumulative preferred stocks, the amount of dividend usually given on a fixed-rate annually. But, it shall always be set aside before calculating the dividend for the common stock and the amount will be accrued for the next period if the dividend is not paid on current period.