"Bul[i]" refers to wealth: Rashi Megillah 15a "Buli"
The property on which the Prozbul is "Staked"
How much land one must own, on which to stake the Prozbul-Bill: Kiddushin 26b
Writing a Prozbul for collection from Territory: Bava Kama 12a
Writing a Prozbul for collection from avadim: Bava Kama 12a
