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.
On June 4, 1998 the Mariners announced that the name of their new ballpark will be Safeco Field. For the right to have their name on the stadium, Safeco, a diversified financial services company whose roots in Seattle date back to 1923, will pay $1.8 million per year for the next 20 years. Safeco Field hosted the 2001 All-Star game.