promissory note
noun [ C ] finance & economics specialized uk/ˈprɒm.ɪ.sər.i ˌnəʊt/ us/ˈprɑː.mɪ.sɔːr.i ˌnoʊt/
本票，期票
a document that contains a promise to pay a stated amount of money to a stated person either on a fixed date or when the money is demanded