Photo Gallery - 12s at 49ers

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A Seattle Seahawks fan poses before an NFL football game between the San Francisco 49ers and the Seahawks in Santa Clara, Calif., Thursday, Nov. 27, 2014. (AP Photo/Marcio Jose Sanchez)

Marcio Jose Sanchez/AP Images

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Seattle Seahawks fans pose before an NFL football game between the San Francisco 49ers and the Seahawks in Santa Clara, Calif., Thursday, Nov. 27, 2014. (AP Photo/Marcio Jose Sanchez)

Marcio Jose Sanchez/AP Images

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PHOTOS: 12s Fill SoFi Stadium For Week 18 at Rams

The 12s are excited for the Seahawks' Week 18 matchup against the Los Angeles Rams at SoFi Stadium on Sunday, January 5, 2025.

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PHOTOS: 12s Fill Soldier Field For Week 17 at Bears

The 12s are excited for the Seahawks' Week 17 matchup against the Chicago Bears at Soldier Field on Thursday, December 26, 2024.

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PHOTOS: 12s Fill Lumen Field For Week 16 vs. Vikings

The 12s are excited for the Seahawks' Week 16 matchup against the Minnesota Vikings at Lumen Field on Sunday, December 22, 2024.

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PHOTOS: 12s Fill Lumen Field For Week 15 vs. Packers

The 12s are excited for the Seahawks' Week 15 matchup against the Green Bay Packers at Lumen Field on Sunday, December 15, 2024.

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PHOTOS: Seahawks Celebrate 40th Anniversary Of The 12s

The Seahawks retired the number 12 40 years ago to celebrate the most passionate and energetic fanbase in the NFL, the 12s. Take a look at some of the best photos of the 12s throughout the organization's history.

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PHOTOS: Seahawks Celebrity 12s

The Seahawks are celebrating the 40th anniversary of the retirement of the number 12 in honor of the best fan base in the NFL so take a look at some of the most notable Seahawks fans.