券 (quàn) is a general noun for documents that represent value or rights, such as tickets, vouchers, coupons, bonds, and deeds. Compared to financial terms like 证券 (zhèngquàn 'securities') and 债券 (zhàiquàn 'bonds'), 券 is broader and can refer to any such paper. It differs from 凭证 (píngzhèng 'proof document'), which emphasizes evidence rather than the document's intrinsic value.