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.
Constructed just a quarter-mile from Arlington Stadium, construction began April 24, 1992 and only took 23 months for the ballpark to be built. Originally named the Ballpark in Arlington, the Rangers played their first game at the ballpark on April 11, 1994 against the Milwaukee Brewers.