Irregular Coupons

Also known as Odd Coupon
Sometimes the first or the last coupon period of a bond can be shorter or longer that the defined period (annual or semi-annual)

Excel Functions

ODDFPRICE	Returns the price per $100 face value for a security having an odd (short or long) first period.
ODDLPRICE	Returns the price per $100 face value for a security having an odd (short or long) last coupon period.