What is this mysterious Signum function? How do we plot it? What is its domain and range? Let's find out. We break down the definition of the function given in set-builder form and plot the graph by connecting points on the cartesian plane. Domain and Range is calculated through visually observing the graph. Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! ( :relations-and-functions-ncert-new/xea4762213f311c5e:functions/e/domain_and_range_0.5) Timestamps: 00:00 Definition of signum function 01:57 Graph drawn by plotting points 02:43 Domain and Range (visually observed) Khan Academy India is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We have videos and exercises that have been translated into multiple Indian languages, and 15 million people around the globe learn on Khan Academy every month. Support Us: Created by Ashish Gupta