零息債券
zero coupon bonds
一種不計息（即票息）的債務證券。零息債券以極高折讓價買賣，到期時則按其十足面值贖回，兩者間的差額可帶來利潤。
A non-interest (ie coupon) of debt securities. Zero coupon bond trading at very discount price, then redeem their full face value at maturity, the difference between the two can be profitable.