promissory note
  本票;期票
  Prom·is·so·ry a. Containing a promise or binding declaration of something to be done or forborne.
  Promissory note Law, a written promise to pay to some person named, and at a time specified therein, or on demand, or at sight, a certain sum of money, absolutely and at all events; -- frequently called a note of hand.
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  promissory note
       n : a promise to pay a specified amount on demand or at a
           certain time; "I had to co-sign his note at the bank"
           [syn: note, note of hand]