there are 6 vertices in a triangular prism.
http://wiki.answers.com/Q/How_many_vertices_are_on...

Six. A triangular prism has a base, and a top. Both of them are triangular. There are three vertices on the triangular base, and three more on the triangular top. That makes a total
http://answers.yahoo.com/question/index?qid=200703...

A triangular prism has a total of four vertices.
http://www.chacha.com/question/howmanyverticesd...

A triangular prism has six vertices  one at each corner of the triangular sides. It also has nine edges  three on each of the triangular sides, and three runing down the length
http://www.webanswers.com/misc/howmanyverticesd...
