It stands for United States Practical Shooting Association, an organization that governs "practical shooting." And what's that, you say? Practical shooting is a sport that sprang out of experimentation with handguns used for self-defense. But it has evolved far beyond its origins in law enforcement to become a fun shooting contest that, according to the organization's website (uspsa.org), obliges shooters, " to take on obstacle-laden shooting courses (called stages) requiring anywhere from six to 30+ shots to complete. The scoring system measures points scored per second, then weights the score to compensate for the number of shots fired…Competitors move, negotiate obstacles, run, speed-reload, and drive their guns through each of several courses as fast as their skills will allow."