RPM is the acronym used for revolutions per minute. It measures the number of revolutions completed in one minute around a fixed axis, giving the speed of a mechanical component. It is commonly used to describe the performance of automobile engines.
Like most ballparks built from the 1990s onward, Safeco Field is a 'retro-modern' style ballpark that incorporates many of the features of ballparks built in the 1950s and earlier with modern amenities.
Melaleuca Field was constructed in 2008 for the local rookie league minor league baseball franchise. It was voted the best new minor league ballpark when it opened in 2009 for the season. The team is a Kansas City Royals farm club, and several of the current Royals have played here over the past 10 years.