👉 In mathematics, an ordinal number is a way of representing a position in a sequence or hierarchy. It is used to denote the rank or order within that hierarchy. Ordinals are often denoted by lowercase Greek letters, such as $\alpha$, $\beta$, etc., which indicate their position from the beginning of the hierarchy. For example, in a set of 30 people (with each person having a unique rank), ordinal notation can be used to represent the positions of these people within this hierarchy
