It is a two (or more) pad component with both pads the same and in the same position, they can be surface mount or PTH pads. They can also be any size you want.
They are used to connect two different signals together at one point (the starpoint), so you create a two (or more) PINS, connect your nets to these pins and then you can join the nets together on the PCB without any design errors.
Quite often used to join two grounds together (!) or for a thevorin connection to a point on a voltage plane or resistor pin, etc.