Penal bill
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
An instrument formerly in use, by which a party bound himself to pay a certain Bum or sums of money, or to do certain acts, or, in default thereof, to pay a certain specified sum by way of penalty; thence termed a "penal sum." These instruments have been superseded by the use of a band in a penal sum, with conditions.
Brown.