A set.
a set is a collection of well defined objects
A collected of well defined objects is called a set.
A collected of well defined objects is called a set.
One possibility is a set.
combination
A set is a collection of well-defined and distinct objects.
One possibility is a set.
a set is defined as a collection of objects. In algebra, it is usually a collection of numbers and often a collection of solutions.
pattern
A combination, of k objects from n.
a set is a group of objects that has a well defined criterion for inclusion within the group.