approximately equal to

asterisk

greater than

grouping symbols 2[ a- 4(d+e) ]

set symbols {1, 2, 3}

degrees

divide 20÷5 = 4

equals

factorial 4! = 4×3×2×1 = 24

infinity

greater than or equal to

multiply

not equal to

Pi

divide 20/5 = 4

less than or equal to

less than

square root ("radical")

subtract

therefore

grouping symbols 2(a−3)