Number - the symbols used to denote the natural numbers. 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 Whole numbers Whole numbers are the numbers starting at 0 0 0 and counting up forever: \{0, 1, 2, 3, 4, 5, 6, 7, 8,9,10, 11...\} { 0 , 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 1 0 , 1 1 . . . } left brace, 0, comma, 1, comma, 2, comma, 3, comma, 4, comma, 5, comma, 6, comma, 7, comma, 8, comma, 9, comma, 10, co...