INDETERMINATE ORDINAL is a mathematical term used to describe a number that cannot be determined exactly. It is usually represented by the letter 'N' followed by a superscripted number, such as NTH. This term is often used when referring to an unknown or unspecified position in a sequence of numbers. For example, if someone asked you to identify the NTH item in a list, you would not be able to give an exact answer because the position of the item is indeterminate.