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.
Safeco Field. Safeco Field encompasses all the best qualities of the modern ballpark: choice downtown location, plenty of local flavor, and innovation that benefits fans. Seattles ballpark is as distinct as any you will find in the Major Leagues, and it all has to do with the first thing you notice about it: the one-of-a-kind retractable roof.