How do the play calling signs in college football work , Just Curious

College football fans have likely noticed large signs held up by assistant coaches and filled with symbols, images and memes. Sam Borden dives in to figure out how this trend began and how, exactly, it all leads to effective playcalling. Subscribe to ESPN+ Get the ESPN App: Subscribe to ESPN on YouTube: Subscribe to ESPN FC on YouTube: Subscribe to NBA on ESPN on YouTube: Watch ESPN on YouTube TV: Exclusive interviews with Rachel Nichols Stephen A. Smith on ESPN ESPN on Social Media: Follow on Twitter: Like on Facebook: Follow on Instagram: Visit ESPN on YouTube to get uptotheminute sports news coverage, scores, highlights and commentary for NFL, NHL, MLB, NBA, College Football, NCAA Basketball, soccer and more. More on