The Collaborative International Dictionary
Pignus
Pignus \Pig"nus\, n.; pl. Pignora. [L.] (Rom. Law) A pledge or pawn.
Wiktionary
pignus
n. (context legal obsolete Ancient Rome English) A pledge or pawn.
Wikipedia
Pignus
Pignus is a spider genus of the Salticidae family (jumping spiders). The two described species occur in Tanzania and South Africa, respectively.