Blanc Seign
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
In Louisiana, a paper signed at the bottom by him who intends to bind himself, give acquittance or compromise, at the discretion of the person whom he intrusts with such blanc seign, giving him power to fill it with what he may think proper, according to agreement.
Musson v. U. S. Bank, 6 Mart. O. S. (Lat) 718.