post-obit bond(n = noun.possession) - a bond made by a reversioner to secure a loan; payable out of his reversion;
is a kind of bond, bond certificate

   A bond in which the obligor, in consideration of having received a certain sum of money, binds himself to pay a larger sum, on unusual interest, on the death of some specified individual from whom he has expectations. Bouvier. [1913 Webster]

bail bond, bearer bond, bond, bond certificate, bond issue, bond paper, bond rating, bond servant, bond service, bond trading, chemical bond, convertible bond, coordinate bond, corporate bond, coupon bond, covalent bond, dative bond, debenture bond, double bond, electrostatic bond, electrovalent bond, government bond, high-yield bond, hydrogen bond, ionic bond, james bond, julian bond, junk bond, letter bond, metallic bond, municipal bond, noncallable bond, peptide bond, performance bond, post-obit, premium bond, registered bond, revenue bond, savings bond, secured bond, surety bond, treasury bond, unsecured bond, utility bond, utility revenue bond, zero coupon bond, zero-coupon bond