What Are the 12s? All About the Intense Seahawks Fan Tradition

In 1984, the Seattle Seahawks officially dubbed their fans “12s”

NEED TO KNOW

• The Seattle Seahawks officially declared their fans “12s” in 1984
• Also known as the 12th man, the moniker is a reference to the crowd’s energy and noise on game days
• With only 11 players allowed on the field, the term symbolizes fans as the team’s “extra” player, often creating a home-field advantage

The Seattle Seahawks are synonymous with the number 12. 

At any home game at Lumen Field, the digits can be spotted across flags, signs, shirts and even a few faces. But unlike most numbers proudly worn by football fans, 12 doesn’t belong to a single player. It belongs to the team’s historically hyped crowd — often described as an extra player on the field dubbed the “12th man.”

“What an atmosphere,” head coach Mike Macdonald told reporters after the Seahawks beat the 49ers in January 2026, advancing to the NFC championship game. “Holy smokes. The 12s, just our organization putting on a great setting.”

He continued, “You do try to actually try to take some time and look around and just understand how incredibly blessed we are with the best fans in the world. It definitely made an impact to start the game. I just want to appreciate this. That was awesome, freaking awesome.”

So, what is the 12th man? Here’s everything to know about the Seattle Seahawks’ tradition and how it started.

What is the 12th man?

The 12th man is the nickname for the Seahawks’ passionate fan base and the role it plays on game days. The term stems from the idea that the crowd’s volume functions like an extra presence on the field, complementing the 11 players allowed on the field at one time.

However, the Seattle-based team wasn’t the first to use the moniker. Texas A&M University called its fans the 12th man in 1922, and officially licensed the term in 1990, according to its website. At the time, they allowed the Seahawks a limited license to use it.

But after the agreement expired in 2016, the NFL team changed their fanbase name from the 12th man to just the “12s.”

Why are Seahawks fans called 12s?

The 12s designation grew out of Seattle’s long-standing reputation for having one of the loudest fan bases in the NFL — noise that has, at times, directly influenced outcomes.

In a 2005 game against the New York Giants, the 12s’ volume led to 11 false-start penalties, the most ever by Seattle fans in a single game. The penalties helped propel the Seahawks to a win, according to the team’s official website.

In 2011, the 12s were so loud they literally moved the earth. During the 2010 NFC Wild Card Game against the New Orleans Saints, Marshawn Lynch broke through multiple defenders for a 67-yard touchdown run.

The moment became known as the “Beast Quake” after the fans’ collective roar registered a 2.3-magnitude seismic event.

Seahawks’ 12s have set not one but two Guinness World Records for the loudest crowd noise at a sporting event, hitting a record of 137.6 dB in 2013.

When did the 12th man tradition start?

According to the Seahawks’ official website, the 12s became an official part of the Seattle Seahawks organization in 1984, when then-president Mike McCormack retired the No. 12 jersey to honor fans.

The tradition has only grown since, including the introduction of the team’s pregame 12 Flag ceremony, which began in 2003.

What have the Seahawks’ players said about the 12s?

The love between the 12s and the Seahawks is mutual. In a January 2026 interview with Pro Football Talk, quarterback Sam Darnold said that playing in front of the 12s was “unlike any other stadium” he’s played in. And his teammates agree.

“The community is special,” defensive tackle Leonard Williams told reporters in January 2026, via the Seahawk’s website. “Even from before I got here, knowing about the Seahawks and knowing about this stadium, Lumen Field, it was always referred to as the best stadium around.”

He continued, “Now being here and being a part of the 12s and being a Seahawk knowing what it’s really like, they really make it come to life and it makes me feel proud to be able to bring the playoff games here.”