Final answer:
A collection of objects that have some characteristic in common is called a set, which is a well-defined collection of distinct objects in mathematics.
Step-by-step explanation:
The term for a collection of numbers, geometric figures, letters, or other objects that have some characteristic in common is c. a set.
Let's explore this concept further with an example. If we have the collection {1, 3, 5, 7, 9}, all elements have the common characteristic of being odd numbers. This collection is referred to as a set of odd numbers less than 10. The term set in mathematics is fundamental to various branches such as algebra, geometry, and number theory. A set is a well-defined collection of distinct objects, considered as an object in its own right.