couple, few, several

couple:            two and two only except in colloquial context.

                              (In reference to people usually takes plural verb.)

few:                    an indefinite small number, the size of which varies with context;

                                        in a large flock of birds, a few might be several dozen

several:            an indefinite small number—more than two, but less than many

See also few, fewer, less, lesser.