Set | Brilliant Math & Science Wiki
https://brilliant.org/wiki/sets/
WEBA set is an unordered group of items (called elements ). For example, \ {\text {cat}, \text {dog}, \text {fish}, \text {bird}\} {cat,dog,fish,bird} is a set of animals, \ {2,4,6,8,10\} {2,4,6,8,10} is a set of even numbers, and \ {a, b, c, d\} {a,b,c,d} is a set of letters.
DA: 10 PA: 29 MOZ Rank: 21