The Seahawks refer to their fans and their stadium as the 12th man, largely due to the noise of the crowd not allowing opposing teams from hearing each other on the field. The team has previously attempted to trademark "12" twice, to no avail. Their applications for "12" were previously denied due to a conflict with a NASCAR team trademark and a hotel's trademark. Currently, the Seahawks are attempting to trademark "12" in the font that appears on their jerseys.
But what is a trademark? A trademark is a word, phrase, symbol or design, or a combination of words, phrases, symbols or designs, that identifies and distinguishes the source of the goods of one party from another.
Effectively, the Seahawks application for "12" in their jersey's font is asserting that it identifies and distinguishes its source as the Seahawks. However, this mark is likely not distinctive enough for trademark registration. Instead, this mark would likely be found as generic. The block letter jersey font, as shown in the picture above, is strikingly similar to many other football teams' fonts, at every amateur and professional level. Because a trademark must identify and distinguish its source, and the term "12" is not distinctive enough on its own, the font's similarity to other team fonts weakens the strength of the mark.
Generic marks can be trademarked if the mark has acquired secondary meaning. That would mean that despite its prima facie generic qualities, that consumers have come to associate the mark with the source of the goods. Although there may be an argument that Seahawks fans may associate articles bearing "12" as having originated from the Seahawks, that argument seems somewhat tenuous. The strong generic nature of the mark may be difficult to overcome and achieve secondary meaning.
Although it should be encouraged for sports teams and athletes to pursue trademark opportunities to protect their brands, the Seahawks attempt to trademark "12" appears to be an overreach.