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.
The new stadium was approved by the Minnesota state legislature in May 2006. Located in the downtown Warehouse District, Target Field is an open-air grass stadium, marking the first time the Twins will play outdoor games at home since 1981 at Metropolitan Stadium, which was replaced by the Mall of America.