what does 13.1 mean

The number 13.1 is a reference to the distance of a half marathon, which is one half of a marathon, consisting of 13.1 miles. In the context of running, a half marathon is a significant challenge involving athletic endurance and dedication. Many runners choose to showcase their completion of a half marathon by placing 13.1 stickers on their vehicles, as a symbol of their achievement and to bring a sense of pride and camaraderie to other runners and non-runners alike.