債務證券

debt security / collateralized debt obligation (CDO), type of bond

debt / CL:筆|笔[bi3]

debt / liability / amount due / indebtedness

affair / business / matter / to be engaged in / to attend to / by all means

certificate / proof / to prove / to demonstrate / to confirm / variant of 症[zheng4]

negotiable security (financial) / certificate / stocks and bonds

bond (esp. document split in two, with each party holding one half) / contract / deed (i.e. title deeds) / ticket / voucher / certificate

variant of 券[quan4]