What is the 90 on t-shirts soundgarden wore?

The "90" on the t-shirts worn by Soundgarden refers to the year 1990, which is significant as it was the year they released their influential album "Louder Than Love." The shirts became iconic within the grunge scene, symbolizing the band's early impact on alternative rock and the music culture of the time. The design has since been embraced by fans and is often associated with the band's legacy.