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.
Since July 1999, the Mariners' home ballpark has been Safeco Field, located south of downtown Seattle. From the team's inception in 1977 until June 1999, the club's home ballpark was the Kingdome. Through the 2014 season, the franchise has finished with a losing record in 26 of 38 seasons.