A **set** is a grouping of objects.

## SymbolsEdit

{,}: Set brackets, the set of

{:}: Set builder notation, the set of ... such that

∅ or {}: the empty set

∈: is an element of

∉: is not an element of

⊂: is a subset of

∪: union

∩: intersect

ℕ: The set of natural numbers (i.e. positive integers)

ℤ: The set of integers

ℚ: The set of rational numbers

ℝ: The set of real numbers