 Snapping one's fingers abruptly and repetitively, often in conjunction with one or more spoken exclamations, is commonly employed in getting someone else's attention.In the film , the villain, Thanos, uses this, in conjunction with the Infinity Gauntlet (a metal glove used to harness the metaphysical power of six super-powered gemstones), to eradicate half of all lifeforms in our universe.He choses "The Snap" as a symbol for something quick and easy.