So it is not surprising that top is part of another expression that describes an important person.

VOA: special.2009.11.29

As part of the project, Mister Teie studied recorded calls of cotton-top tamarin monkeys.

VOA: special.2009.09.29

The top of something is the highest part.

VOA: special.2009.11.29

The very top of the wire drawing represents the only part of the ocean landscape that can be seen on the surface of the water: It is Bouvet Island, one of the most isolated islands in the world.

VOA: special.2009.05.06

The four former top generals, who were suspected of playing a part in the February,2005 slaying of former Prime Minister Hariri, have been jailed for nearly four years.

VOA: standard.2009.04.30