The Big A Sign is a 230-foot-tall (70 m), 210-ton red metal sign in the shape of a letter "A" with a halo on top situated in the parking lot of Angel Stadium in Anaheim, California. The sign was originally installed in 1966 behind the left field fence but was moved to the parking lot in 1979 when American football's Los Angeles Rams started sharing the stadium with baseball's Los Angeles Angels of Anaheim (whose logo it represents). The sign is also responsible for the nickname of Angel Stadium as "The Big A".
The sign was erected in 1966 outside Angel Stadium in Anaheim specifically to hold the scoreboard. The $1 million construction cost was covered by Standard Oil of California in exchange for a 10-year advertising rights deal on the sign. The sign was initially colored white. Measuring 230 feet (70 m) in height, at the time of its construction it was the tallest structure in Orange County, at 23 stories tall.
In 1979, when the Los Angeles Rams moved in, Angel Stadium of Anaheim was retrofitted to make it suitable to host American football games. As a result, the Big A Sign was moved from its position overlooking the stadium into the parking lot, despite protests from Angels fans and owners. Approximately 1,000 people came to watch the sign be moved. However, after it had been moved approximately 10 feet (3.0 m), one of the dollies started to tilt the sign, requiring the seven-hour move to be postponed until the next day.
In 1995, when the Rams moved out of Angel Stadium to become the St. Louis Rams, a number of the 1979 retrofits were removed. As a result, there were proposals to move the sign back to its original location. However, this did not occur owing to the cost of moving it and because it had become a good meeting place for fans and afforded the Angels the opportunity to advertise to passing motorists.
Since its move to the parking lot, the Big A Sign has been used to advertise for the Angels' sponsors, and the old scoreboard has been used as an electronic marquee to promote upcoming Major League Baseball games to passing motorists on the nearby freeway. The halo on the top of the sign lights up to signify to passersby and nearby motorists that the Angels have won a game.