Weren't they were originally called the Greatest show on Earth ? but it quickly was changed by Chris Berman or someone in the NFL media to turf because of how fast they ran on the carpet inside the STL dome?
From WIKI:
The term "Greatest Show on Turf" was not used to describe the Rams offense until several weeks into the 2000 season; initially the nickname for the Rams offense had been "The Warner Brothers", a play on
the movie studio and a reference to new quarterback
Kurt Warner, who'd assumed leadership from center after slated starter
Trent Green was injured against
San Diego in the preseason, and his receivers. The first appearance of the term came when
ESPN's
Chris Berman, preparing to cover highlights of a 57-31 win over the San Diego Chargers that year, said to television audiences, "Forget
Ringling Brothers; the Rams are the Greatest Show on Earth." Over the following weeks, "Earth" was replaced with "Turf" to signify the
artificial playing surface of the
Trans World Dome and how it magnified and enhanced the Rams' already speedy offense. The term was retroactively applied to the 1999 team, as the offensive philosophy and key players were the same.