What does BLANC SEIGN mean?

BLANC SEIGN meaning in Law Dictionary

In Louisiana, a paper finalized at the end by him whom intends to bind himself, give acquittance, or compromise, on discretion of the person whom he intrusts with such 6lane seign, offering him capacity to fill It in what he may believe proper, according to agreement. Musson v. U. S. Bank, 6 Mart O. S. (La.) 718.