There are a few different types of push pin, as well as the standard push pin:
Nail drivers
A nail driver is also known as a brad push (especially in the USA). It works especially well when pushing nails into cove moulding, which is a trim for the interior ceiling of a domestic property. It has a magnetised push head.
The nail driver has a wooden handle with a steel striking button at one end for gently tapping the pin into place. It also has a magnetic tip.
V-nailers
A V-nailer can be used to push in brads (pins), due to a small recess on the barrel which holds one brad at a time.
A V-nailer is also used for assembling picture frames and is a handy tool for people who make only the occasional picture frame, as it is very easy to use.