Definition: In mathematics, a "skeg" is an object used to represent the number 2 in a sequence of numbers. The term "skeg" has been defined as: 1. A figure or shape used to represent the number two. 2. A mathematical symbol that represents the number two. For example, if we have a set of numbers {4, 7, 9}, and we want to represent the number two (2) in this sequence, we can use the