Stick Tops

Ball top

Round, ball like top for a joystick
Common with Japanese style joysticks

Bat top

A Tear, pear or bat (as in base ball bat) shape top for joy stick
Common with American style joysticks

Cylindrical

A Cylindrical or cylindrical like shape for joysticks, sometimes a Cylindrical top will have a button on the top of the stick
Some Cylindrical tops are not smooth but octagonal like the Atari 2600 joystick.

Trigger handle

A trigger handle also referred to as a flight stick