Secret lien
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
A lien reserved by the vendor of .chattels, who has delivered them to the vendee, to secure the payment of the price, which is concealed from all third persons. As to the particular kinds of liens described as "Bailee's," "Judgment," "Maritime," "Mechanics'," "Municipal," and "Vendors' " liens, see those titles.