Big Oh : Big Oh denotes "fewer than or the same as" <expression> iterations.

Big Omega :Big Omega denotes "more than or the same as" <expression> iterations.

Big Theta: Big Theta denotes "the same as" <expression> iterations.

Little Oh : Little Oh denotes "fewer than" <expression> iterations.

Little Omega : Little Omega denotes "more than" <expression> iterations.