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.
A capacity crowd filled Safeco Field on its opening day, July 15, 1999. Three levels of seating extend from the left field foul pole to home plate around to the right field foul pole and into right-centerfield. Bleacher seats are above the bullpens in left field.