According to Varsity Spirit, POM dance is "A pom routine incorporates the following characteristics: clean, sharp, strong, precise motions; synchronization; visual effects. It may also include Pom Skills (i.e. pom passes, kick lines, leaps and turns, jumps, etc.). Poms must be used 80% of the routine.
Here is an example of a Pom Dance team (Ohio State University) compeiting at UDA competition.